131979231 has 6 divisors (see below), whose sum is σ = 190636680. Its totient is φ = 87986148.

The previous prime is 131979209. The next prime is 131979293. The reversal of 131979231 is 132979131.

It is a happy number.

It is not a de Polignac number, because 131979231 - 2¹⁰ = 131978207 is a prime.

It is a super-2 number, since 2×131979231² = 34837034830702722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131979931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7332171 + ... + 7332188.

It is an arithmetic number, because the mean of its divisors is an integer number (31772780).

Almost surely, 2^131979231 is an apocalyptic number.

131979231 is a deficient number, since it is larger than the sum of its proper divisors (58657449).

131979231 is a wasteful number, since it uses less digits than its factorization.

131979231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14664365 (or 14664362 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 131979231 is about 11488.2214028108. The cubic root of 131979231 is about 509.1376314387.

The spelling of 131979231 in words is "one hundred thirty-one million, nine hundred seventy-nine thousand, two hundred thirty-one".