131979187 has 4 divisors (see below), whose sum is σ = 138925480. Its totient is φ = 125032896.

The previous prime is 131979181. The next prime is 131979191. The reversal of 131979187 is 781979131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781979131 = 2683 ⋅291457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131979187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131979181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3473118 + ... + 3473155.

It is an arithmetic number, because the mean of its divisors is an integer number (34731370).

Almost surely, 2^131979187 is an apocalyptic number.

131979187 is a deficient number, since it is larger than the sum of its proper divisors (6946293).

131979187 is an equidigital number, since it uses as much as digits as its factorization.

131979187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6946292.

The product of its digits is 95256, while the sum is 46.

The square root of 131979187 is about 11488.2194878058. The cubic root of 131979187 is about 509.1375748590.

The spelling of 131979187 in words is "one hundred thirty-one million, nine hundred seventy-nine thousand, one hundred eighty-seven".