131691344 has 40 divisors (see below), whose sum is σ = 262566528. Its totient is φ = 63947520.

The previous prime is 131691331. The next prime is 131691359. The reversal of 131691344 is 443196131.

It is a super-2 number, since 2×131691344² = 34685220169052672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131691344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240479 + ... + 241025.

Almost surely, 2^131691344 is an apocalyptic number.

It is an amenable number.

131691344 is a deficient number, since it is larger than the sum of its proper divisors (130875184).

131691344 is a wasteful number, since it uses less digits than its factorization.

131691344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 957 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 131691344 is about 11475.6849033075. The cubic root of 131691344 is about 508.7671670664.

The spelling of 131691344 in words is "one hundred thirty-one million, six hundred ninety-one thousand, three hundred forty-four".