131522691 has 4 divisors (see below), whose sum is σ = 175363592. Its totient is φ = 87681792.

The previous prime is 131522663. The next prime is 131522701. The reversal of 131522691 is 196225131.

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

It is not a de Polignac number, because 131522691 - 2⁷ = 131522563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131522191) 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, 21920446 + ... + 21920451.

It is an arithmetic number, because the mean of its divisors is an integer number (43840898).

Almost surely, 2^131522691 is an apocalyptic number.

131522691 is a deficient number, since it is larger than the sum of its proper divisors (43840901).

131522691 is an equidigital number, since it uses as much as digits as its factorization.

131522691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43840900.

The product of its digits is 3240, while the sum is 30.

The square root of 131522691 is about 11468.3342731192. The cubic root of 131522691 is about 508.5498868670.

The spelling of 131522691 in words is "one hundred thirty-one million, five hundred twenty-two thousand, six hundred ninety-one".