31113505521 has 12 divisors (see below), whose sum is σ = 51361977472. Its totient is φ = 17779145976.

The previous prime is 31113505463. The next prime is 31113505559. The reversal of 31113505521 is 12550531113.

31113505521 is a `hidden beast` number, since 3 + 1 + 1 + 135 + 0 + 5 + 521 = 666.

It is not a de Polignac number, because 31113505521 - 2⁶ = 31113505457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31113505561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246932521 + ... + 246932646.

Almost surely, 2^31113505521 is an apocalyptic number.

It is an amenable number.

31113505521 is a deficient number, since it is larger than the sum of its proper divisors (20248471951).

31113505521 is a wasteful number, since it uses less digits than its factorization.

31113505521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493865180 (or 493865177 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The spelling of 31113505521 in words is "thirty-one billion, one hundred thirteen million, five hundred five thousand, five hundred twenty-one".