31318492725 has 144 divisors (see below), whose sum is σ = 64454356800. Its totient is φ = 14885095680.

The previous prime is 31318492717. The next prime is 31318492747. The reversal of 31318492725 is 52729481313.

It is a happy number.

31318492725 is a `hidden beast` number, since 3 + 131 + 8 + 492 + 7 + 25 = 666.

It is not a de Polignac number, because 31318492725 - 2³ = 31318492717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3303442 + ... + 3312908.

It is an arithmetic number, because the mean of its divisors is an integer number (447599700).

Almost surely, 2^31318492725 is an apocalyptic number.

It is an amenable number.

31318492725 is an abundant number, since it is smaller than the sum of its proper divisors (33135864075).

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

31318492725 is a wasteful number, since it uses less digits than its factorization.

31318492725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541 (or 9517 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 31318492725 in words is "thirty-one billion, three hundred eighteen million, four hundred ninety-two thousand, seven hundred twenty-five".