131979 has 16 divisors (see below), whose sum is σ = 191520. Its totient is φ = 80640.

The previous prime is 131969. The next prime is 132001. The reversal of 131979 is 979131.

It is not a de Polignac number, because 131979 - 2⁵ = 131947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3199 + ... + 3239.

It is an arithmetic number, because the mean of its divisors is an integer number (11970).

2¹³¹⁹⁷⁹ is an apocalyptic number.

131979 is a deficient number, since it is larger than the sum of its proper divisors (59541).

131979 is a wasteful number, since it uses less digits than its factorization.

131979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110.

The product of its digits is 1701, while the sum is 30.

The square root of 131979 is about 363.2891410433. The cubic root of 131979 is about 50.9137334395.

The spelling of 131979 in words is "one hundred thirty-one thousand, nine hundred seventy-nine".