117639217 has 4 divisors (see below), whose sum is σ = 117665136. Its totient is φ = 117613300.

The previous prime is 117639187. The next prime is 117639251. The reversal of 117639217 is 712936711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117639217 - 2¹⁵ = 117606449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117639517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4159 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (29416284).

Almost surely, 2^117639217 is an apocalyptic number.

It is an amenable number.

117639217 is a deficient number, since it is larger than the sum of its proper divisors (25919).

117639217 is an equidigital number, since it uses as much as digits as its factorization.

117639217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25918.

The product of its digits is 15876, while the sum is 37.

The square root of 117639217 is about 10846.1613947055. The cubic root of 117639217 is about 489.9864177826.

The spelling of 117639217 in words is "one hundred seventeen million, six hundred thirty-nine thousand, two hundred seventeen".