31716317857 has 64 divisors (see below), whose sum is σ = 39247488000. Its totient is φ = 25581104640.

The previous prime is 31716317851. The next prime is 31716317921. The reversal of 31716317857 is 75871361713.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-31716317857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 31716317857.

It is not an unprimeable number, because it can be changed into a prime (31716317851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 101329933 + ... + 101330245.

It is an arithmetic number, because the mean of its divisors is an integer number (613242000).

Almost surely, 2^31716317857 is an apocalyptic number.

It is an amenable number.

31716317857 is a deficient number, since it is larger than the sum of its proper divisors (7531170143).

31716317857 is a wasteful number, since it uses less digits than its factorization.

31716317857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 577 counting only the distinct ones).

The product of its digits is 740880, while the sum is 49.

The spelling of 31716317857 in words is "thirty-one billion, seven hundred sixteen million, three hundred seventeen thousand, eight hundred fifty-seven".