231786947931 has 48 divisors (see below), whose sum is σ = 408660268800. Its totient is φ = 114071474880.

The previous prime is 231786947929. The next prime is 231786947939. The reversal of 231786947931 is 139749687132.

It is not a de Polignac number, because 231786947931 - 2¹ = 231786947929 is a prime.

It is a super-2 number, since 2×231786947931² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (231786947939) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2352216 + ... + 2448773.

It is an arithmetic number, because the mean of its divisors is an integer number (8513755600).

Almost surely, 2^231786947931 is an apocalyptic number.

231786947931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231786947931 is a deficient number, since it is larger than the sum of its proper divisors (176873320869).

231786947931 is a wasteful number, since it uses less digits than its factorization.

231786947931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801040 (or 4801029 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 60.

The spelling of 231786947931 in words is "two hundred thirty-one billion, seven hundred eighty-six million, nine hundred forty-seven thousand, nine hundred thirty-one".