131979929 has 2 divisors, whose sum is σ = 131979930. Its totient is φ = 131979928.

The previous prime is 131979917. The next prime is 131979931. The reversal of 131979929 is 929979131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111936400 + 20043529 = 10580^2 + 4477^2 .

It is an emirp because it is prime and its reverse (929979131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131979929 - 2²⁴ = 115202713 is a prime.

Together with 131979931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131979949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65989964 + 65989965.

It is an arithmetic number, because the mean of its divisors is an integer number (65989965).

Almost surely, 2^131979929 is an apocalyptic number.

It is an amenable number.

131979929 is a deficient number, since it is larger than the sum of its proper divisors (1).

131979929 is an equidigital number, since it uses as much as digits as its factorization.

131979929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 50.

The square root of 131979929 is about 11488.2517817116. The cubic root of 131979929 is about 509.1385289977.

The spelling of 131979929 in words is "one hundred thirty-one million, nine hundred seventy-nine thousand, nine hundred twenty-nine".