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161909540 = 22513622729
BaseRepresentation
bin10011010011010…
…00101100100100
3102021122212010122
421221220230210
5312422101130
624022141112
74004131322
oct1151505444
9367585118
10161909540
1183437041
1246281798
132770b980
1417708d12
15e3332e5
hex9a68b24

161909540 has 24 divisors (see below), whose sum is σ = 366165240. Its totient is φ = 59781888.

The previous prime is 161909483. The next prime is 161909551. The reversal of 161909540 is 45909161.

It can be written as a sum of positive squares in 4 ways, for example, as 1532644 + 160376896 = 1238^2 + 12664^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161909540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311105 + ... + 311624.

It is an arithmetic number, because the mean of its divisors is an integer number (15256885).

Almost surely, 2161909540 is an apocalyptic number.

161909540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161909540 is an abundant number, since it is smaller than the sum of its proper divisors (204255700).

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

161909540 is a wasteful number, since it uses less digits than its factorization.

161909540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622751 (or 622749 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 161909540 is about 12724.3679607280. The cubic root of 161909540 is about 545.0346918410.

The spelling of 161909540 in words is "one hundred sixty-one million, nine hundred nine thousand, five hundred forty".

Divisors: 1 2 4 5 10 13 20 26 52 65 130 260 622729 1245458 2490916 3113645 6227290 8095477 12454580 16190954 32381908 40477385 80954770 161909540