117644591 has 2 divisors, whose sum is σ = 117644592. Its totient is φ = 117644590.

The previous prime is 117644587. The next prime is 117644627. The reversal of 117644591 is 195446711.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117644591 - 2² = 117644587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117644521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58822295 + 58822296.

It is an arithmetic number, because the mean of its divisors is an integer number (58822296).

Almost surely, 2^117644591 is an apocalyptic number.

117644591 is a deficient number, since it is larger than the sum of its proper divisors (1).

117644591 is an equidigital number, since it uses as much as digits as its factorization.

117644591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 117644591 is about 10846.4091292925. The cubic root of 117644591 is about 489.9938788629.

The spelling of 117644591 in words is "one hundred seventeen million, six hundred forty-four thousand, five hundred ninety-one".