31245506881 has 16 divisors (see below), whose sum is σ = 33551340480. Its totient is φ = 28994273280.

The previous prime is 31245506869. The next prime is 31245506909. The reversal of 31245506881 is 18860554213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31245506881 is a prime.

It is a super-2 number, since 2×31245506881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31245506581) 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, 343105 + ... + 424513.

It is an arithmetic number, because the mean of its divisors is an integer number (2096958780).

Almost surely, 2^31245506881 is an apocalyptic number.

It is an amenable number.

31245506881 is a deficient number, since it is larger than the sum of its proper divisors (2305833599).

31245506881 is a wasteful number, since it uses less digits than its factorization.

31245506881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81744.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 31245506881 in words is "thirty-one billion, two hundred forty-five million, five hundred six thousand, eight hundred eighty-one".