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31304255 = 571109809
BaseRepresentation
bin111011101101…
…0101000111111
32011220102100212
41313122220333
531003214010
63034543035
7530040023
oct167325077
964812325
1031304255
1116741394
12a597a7b
136640838
14422c383
152b35505
hex1ddaa3f

31304255 has 16 divisors (see below), whose sum is σ = 38491200. Its totient is φ = 24433920.

The previous prime is 31304239. The next prime is 31304261. The reversal of 31304255 is 55240313.

It is not a de Polignac number, because 31304255 - 24 = 31304239 is a prime.

It is a super-2 number, since 2×313042552 = 1959912762210050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31304255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38291 + ... + 39099.

It is an arithmetic number, because the mean of its divisors is an integer number (2405700).

Almost surely, 231304255 is an apocalyptic number.

31304255 is a deficient number, since it is larger than the sum of its proper divisors (7186945).

31304255 is a wasteful number, since it uses less digits than its factorization.

31304255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 31304255 is about 5595.0205540284. The cubic root of 31304255 is about 315.1624424607.

Adding to 31304255 its reverse (55240313), we get a palindrome (86544568).

The spelling of 31304255 in words is "thirty-one million, three hundred four thousand, two hundred fifty-five".

Divisors: 1 5 71 109 355 545 809 4045 7739 38695 57439 88181 287195 440905 6260851 31304255