31256931057 has 16 divisors (see below), whose sum is σ = 45889535232. Its totient is φ = 18766549520.

The previous prime is 31256931047. The next prime is 31256931071. The reversal of 31256931057 is 75013965213.

It is a cyclic number.

It is not a de Polignac number, because 31256931057 - 2²⁰ = 31255882481 is a prime.

It is a super-2 number, since 2×31256931057² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31256931047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4422543 + ... + 4429604.

It is an arithmetic number, because the mean of its divisors is an integer number (2868095952).

Almost surely, 2^31256931057 is an apocalyptic number.

It is an amenable number.

31256931057 is a deficient number, since it is larger than the sum of its proper divisors (14632604175).

31256931057 is a wasteful number, since it uses less digits than its factorization.

31256931057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852268.

The product of its (nonzero) digits is 170100, while the sum is 42.

The spelling of 31256931057 in words is "thirty-one billion, two hundred fifty-six million, nine hundred thirty-one thousand, fifty-seven".