131665879 has 6 divisors (see below), whose sum is σ = 133551560. Its totient is φ = 129806460.

The previous prime is 131665841. The next prime is 131665889. The reversal of 131665879 is 978566131.

It is a happy number.

It is not a de Polignac number, because 131665879 - 2⁹ = 131665367 is a prime.

It is a pancake number, because a pancake can be divided into 131665879 parts by 16227 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131665819) 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, 8019 + ... + 18100.

Almost surely, 2^131665879 is an apocalyptic number.

131665879 is a deficient number, since it is larger than the sum of its proper divisors (1885681).

131665879 is an frugal number, since it uses more digits than its factorization.

131665879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26261 (or 26190 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 131665879 is about 11474.5753298325. The cubic root of 131665879 is about 508.7343717166.

The spelling of 131665879 in words is "one hundred thirty-one million, six hundred sixty-five thousand, eight hundred seventy-nine".