2157179931 has 10 divisors (see below), whose sum is σ = 3222454092. Its totient is φ = 1438119900.

The previous prime is 2157179923. The next prime is 2157179933. The reversal of 2157179931 is 1399717512.

It is a happy number.

2157179931 is a `hidden beast` number, since 2 + 1 + 571 + 79 + 9 + 3 + 1 = 666.

It is not a de Polignac number, because 2157179931 - 2³ = 2157179923 is a prime.

It is a super-2 number, since 2×2157179931² = 9306850509418329522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157179933) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13315845 + ... + 13316006.

Almost surely, 2^2157179931 is an apocalyptic number.

2157179931 is a deficient number, since it is larger than the sum of its proper divisors (1065274161).

2157179931 is an equidigital number, since it uses as much as digits as its factorization.

2157179931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26631863 (or 26631854 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 2157179931 is about 46445.4511335610. The cubic root of 2157179931 is about 1292.0980084172.

The spelling of 2157179931 in words is "two billion, one hundred fifty-seven million, one hundred seventy-nine thousand, nine hundred thirty-one".