131533979 has 4 divisors (see below), whose sum is σ = 138456840. Its totient is φ = 124611120.

The previous prime is 131533957. The next prime is 131533993. The reversal of 131533979 is 979335131.

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

It is not a de Polignac number, because 131533979 - 2¹⁶ = 131468443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131533379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461402 + ... + 3461439.

It is an arithmetic number, because the mean of its divisors is an integer number (34614210).

Almost surely, 2^131533979 is an apocalyptic number.

131533979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131533979 is a deficient number, since it is larger than the sum of its proper divisors (6922861).

131533979 is an equidigital number, since it uses as much as digits as its factorization.

131533979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6922860.

The product of its digits is 76545, while the sum is 41.

The square root of 131533979 is about 11468.8264002905. The cubic root of 131533979 is about 508.5644352994.

The spelling of 131533979 in words is "one hundred thirty-one million, five hundred thirty-three thousand, nine hundred seventy-nine".