131809979 has 8 divisors (see below), whose sum is σ = 152333280. Its totient is φ = 111710016.

The previous prime is 131809967. The next prime is 131809981. The reversal of 131809979 is 979908131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131809979 - 2⁸ = 131809723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131809939) 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 7 ways as a sum of consecutive naturals, for example, 105164 + ... + 106409.

It is an arithmetic number, because the mean of its divisors is an integer number (19041660).

Almost surely, 2^131809979 is an apocalyptic number.

131809979 is a deficient number, since it is larger than the sum of its proper divisors (20523301).

131809979 is an equidigital number, since it uses as much as digits as its factorization.

131809979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211669.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 131809979 is about 11480.8527122335. The cubic root of 131809979 is about 508.9198966120.

The spelling of 131809979 in words is "one hundred thirty-one million, eight hundred nine thousand, nine hundred seventy-nine".