117566591 has 2 divisors, whose sum is σ = 117566592. Its totient is φ = 117566590.

The previous prime is 117566563. The next prime is 117566621. The reversal of 117566591 is 195665711.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117566591 is a prime.

It is a super-2 number, since 2×117566591² = 27643806638722562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117566531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58783295 + 58783296.

It is an arithmetic number, because the mean of its divisors is an integer number (58783296).

Almost surely, 2^117566591 is an apocalyptic number.

117566591 is a deficient number, since it is larger than the sum of its proper divisors (1).

117566591 is an equidigital number, since it uses as much as digits as its factorization.

117566591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 117566591 is about 10842.8128730510. The cubic root of 117566591 is about 489.8855640025.

The spelling of 117566591 in words is "one hundred seventeen million, five hundred sixty-six thousand, five hundred ninety-one".