117156217 has 4 divisors (see below), whose sum is σ = 118293760. Its totient is φ = 116018676.

The previous prime is 117156203. The next prime is 117156239. The reversal of 117156217 is 712651711.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-117156217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117156257) 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, 568617 + ... + 568822.

It is an arithmetic number, because the mean of its divisors is an integer number (29573440).

Almost surely, 2^117156217 is an apocalyptic number.

It is an amenable number.

117156217 is a deficient number, since it is larger than the sum of its proper divisors (1137543).

117156217 is a wasteful number, since it uses less digits than its factorization.

117156217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137542.

The product of its digits is 2940, while the sum is 31.

The square root of 117156217 is about 10823.8725509865. The cubic root of 117156217 is about 489.3149068070.

The spelling of 117156217 in words is "one hundred seventeen million, one hundred fifty-six thousand, two hundred seventeen".