31320472157 has 32 divisors (see below), whose sum is σ = 37341265920. Its totient is φ = 25991824320.

The previous prime is 31320472133. The next prime is 31320472163. The reversal of 31320472157 is 75127402313.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31320472157 - 2⁸ = 31320471901 is a prime.

It is a super-2 number, since 2×31320472157² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320472177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 699782 + ... + 743192.

It is an arithmetic number, because the mean of its divisors is an integer number (1166914560).

Almost surely, 2^31320472157 is an apocalyptic number.

It is an amenable number.

31320472157 is a deficient number, since it is larger than the sum of its proper divisors (6020793763).

31320472157 is a wasteful number, since it uses less digits than its factorization.

31320472157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43593.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 31320472157 in words is "thirty-one billion, three hundred twenty million, four hundred seventy-two thousand, one hundred fifty-seven".