117631521 has 20 divisors (see below), whose sum is σ = 200825152. Its totient is φ = 67217688.

The previous prime is 117631471. The next prime is 117631529. The reversal of 117631521 is 125136711.

117631521 is a `hidden beast` number, since 1 + 1 + 7 + 631 + 5 + 21 = 666.

It is not a de Polignac number, because 117631521 - 2¹⁵ = 117598753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117631529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 103165 + ... + 104298.

Almost surely, 2^117631521 is an apocalyptic number.

It is an amenable number.

117631521 is a deficient number, since it is larger than the sum of its proper divisors (83193631).

117631521 is an equidigital number, since it uses as much as digits as its factorization.

117631521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207482 (or 207473 counting only the distinct ones).

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

The square root of 117631521 is about 10845.8066090079. The cubic root of 117631521 is about 489.9757325202.

The spelling of 117631521 in words is "one hundred seventeen million, six hundred thirty-one thousand, five hundred twenty-one".