131273979 has 4 divisors (see below), whose sum is σ = 175031976. Its totient is φ = 87515984.

The previous prime is 131273977. The next prime is 131274007. The reversal of 131273979 is 979372131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131273979 - 2¹ = 131273977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131273979.

It is not an unprimeable number, because it can be changed into a prime (131273977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21878994 + ... + 21878999.

It is an arithmetic number, because the mean of its divisors is an integer number (43757994).

Almost surely, 2^131273979 is an apocalyptic number.

131273979 is a deficient number, since it is larger than the sum of its proper divisors (43757997).

131273979 is an equidigital number, since it uses as much as digits as its factorization.

131273979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43757996.

The product of its digits is 71442, while the sum is 42.

The square root of 131273979 is about 11457.4857189525. The cubic root of 131273979 is about 508.2291253079.

The spelling of 131273979 in words is "one hundred thirty-one million, two hundred seventy-three thousand, nine hundred seventy-nine".