117215687 has 2 divisors, whose sum is σ = 117215688. Its totient is φ = 117215686.

The previous prime is 117215653. The next prime is 117215699. The reversal of 117215687 is 786512711.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117215687 - 2²² = 113021383 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117215687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117215647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58607843 + 58607844.

It is an arithmetic number, because the mean of its divisors is an integer number (58607844).

Almost surely, 2^117215687 is an apocalyptic number.

117215687 is a deficient number, since it is larger than the sum of its proper divisors (1).

117215687 is an equidigital number, since it uses as much as digits as its factorization.

117215687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 38.

The square root of 117215687 is about 10826.6193707916. The cubic root of 117215687 is about 489.3976869783.

The spelling of 117215687 in words is "one hundred seventeen million, two hundred fifteen thousand, six hundred eighty-seven".