117644391 has 24 divisors (see below), whose sum is σ = 173206176. Its totient is φ = 76930560.

The previous prime is 117644347. The next prime is 117644441. The reversal of 117644391 is 193446711.

117644391 is a `hidden beast` number, since 1 + 1 + 7 + 644 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 117644391 - 2⁶ = 117644327 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117644311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157966 + ... + 158708.

It is an arithmetic number, because the mean of its divisors is an integer number (7216924).

Almost surely, 2^117644391 is an apocalyptic number.

117644391 is a deficient number, since it is larger than the sum of its proper divisors (55561785).

117644391 is a wasteful number, since it uses less digits than its factorization.

117644391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063 (or 1060 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 117644391 is about 10846.3999096474. The cubic root of 117644391 is about 489.9936011937.

The spelling of 117644391 in words is "one hundred seventeen million, six hundred forty-four thousand, three hundred ninety-one".