31868887931 has 8 divisors (see below), whose sum is σ = 32016466944. Its totient is φ = 31721473000.

The previous prime is 31868887927. The next prime is 31868887943. The reversal of 31868887931 is 13978886813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31868887931 - 2² = 31868887927 is a prime.

It is a super-2 number, since 2×31868887931² (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 (31868857931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357230 + ... + 437436.

It is an arithmetic number, because the mean of its divisors is an integer number (4002058368).

Almost surely, 2^31868887931 is an apocalyptic number.

31868887931 is a deficient number, since it is larger than the sum of its proper divisors (147579013).

31868887931 is a wasteful number, since it uses less digits than its factorization.

31868887931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82041.

The product of its digits is 13934592, while the sum is 62.

The spelling of 31868887931 in words is "thirty-one billion, eight hundred sixty-eight million, eight hundred eighty-seven thousand, nine hundred thirty-one".