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561081612 = 2237131134547
BaseRepresentation
bin100001011100010…
…110110100001100
31110002202220021110
4201130112310030
52122114102422
6131401532020
716622054310
oct4134266414
91402686243
10561081612
11268796a13
12137aa4010
138c320470
1454735b40
15343d160c
hex21716d0c

561081612 has 96 divisors (see below), whose sum is σ = 1625928192. Its totient is φ = 146635776.

The previous prime is 561081581. The next prime is 561081623. The reversal of 561081612 is 216180165.

It is a self number, because there is not a number n which added to its sum of digits gives 561081612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121123 + ... + 125669.

It is an arithmetic number, because the mean of its divisors is an integer number (16936752).

Almost surely, 2561081612 is an apocalyptic number.

561081612 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561081612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812964096).

561081612 is an abundant number, since it is smaller than the sum of its proper divisors (1064846580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561081612 is a wasteful number, since it uses less digits than its factorization.

561081612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687 (or 4685 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 561081612 is about 23687.1613326713. The cubic root of 561081612 is about 824.7873891062.

The spelling of 561081612 in words is "five hundred sixty-one million, eighty-one thousand, six hundred twelve".

Divisors: 1 2 3 4 6 7 12 13 14 21 26 28 39 42 52 78 84 91 113 156 182 226 273 339 364 452 546 678 791 1092 1356 1469 1582 2373 2938 3164 4407 4547 4746 5876 8814 9094 9492 10283 13641 17628 18188 20566 27282 30849 31829 41132 54564 59111 61698 63658 95487 118222 123396 127316 177333 190974 236444 354666 381948 413777 513811 709332 827554 1027622 1241331 1541433 1655108 2055244 2482662 3082866 3596677 4965324 6165732 6679543 7193354 10790031 13359086 14386708 20038629 21580062 26718172 40077258 43160124 46756801 80154516 93513602 140270403 187027204 280540806 561081612