285978861931 has 16 divisors (see below), whose sum is σ = 348179731200. Its totient is φ = 229425555168.

The previous prime is 285978861923. The next prime is 285978861937. The reversal of 285978861931 is 139168879582.

It is a cyclic number.

It is not a de Polignac number, because 285978861931 - 2³ = 285978861923 is a prime.

It is a super-2 number, since 2×285978861931² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (285978861937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12942076 + ... + 12964153.

It is an arithmetic number, because the mean of its divisors is an integer number (21761233200).

Almost surely, 2^285978861931 is an apocalyptic number.

285978861931 is a deficient number, since it is larger than the sum of its proper divisors (62200869269).

285978861931 is a wasteful number, since it uses less digits than its factorization.

285978861931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25906338.

The product of its digits is 52254720, while the sum is 67.

The spelling of 285978861931 in words is "two hundred eighty-five billion, nine hundred seventy-eight million, eight hundred sixty-one thousand, nine hundred thirty-one".