31881786852 has 24 divisors (see below), whose sum is σ = 74699518432. Its totient is φ = 10583164800.

The previous prime is 31881786841. The next prime is 31881786863. The reversal of 31881786852 is 25868718813.

It is an interprime number because it is at equal distance from previous prime (31881786841) and next prime (31881786863).

It is a junction number, because it is equal to n+sod(n) for n = 31881786792 and 31881786801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5509174 + ... + 5514957.

Almost surely, 2^31881786852 is an apocalyptic number.

It is an amenable number.

31881786852 is an abundant number, since it is smaller than the sum of its proper divisors (42817731580).

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

31881786852 is a wasteful number, since it uses less digits than its factorization.

31881786852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11024379 (or 11024377 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 57.

The spelling of 31881786852 in words is "thirty-one billion, eight hundred eighty-one million, seven hundred eighty-six thousand, eight hundred fifty-two".