131715621 has 36 divisors (see below), whose sum is σ = 199882956. Its totient is φ = 83566080.

The previous prime is 131715607. The next prime is 131715707. The reversal of 131715621 is 126517131.

131715621 is a `hidden beast` number, since 1 + 31 + 7 + 1 + 5 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48650625 + 83064996 = 6975^2 + 9114^2 .

It is not a de Polignac number, because 131715621 - 2⁶ = 131715557 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131715601) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 838875 + ... + 839031.

Almost surely, 2^131715621 is an apocalyptic number.

It is an amenable number.

131715621 is a deficient number, since it is larger than the sum of its proper divisors (68167335).

131715621 is a wasteful number, since it uses less digits than its factorization.

131715621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 288 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 131715621 is about 11476.7426127800. The cubic root of 131715621 is about 508.7984285025.

The spelling of 131715621 in words is "one hundred thirty-one million, seven hundred fifteen thousand, six hundred twenty-one".