117915887 has 2 divisors, whose sum is σ = 117915888. Its totient is φ = 117915886.

The previous prime is 117915869. The next prime is 117915899. The reversal of 117915887 is 788519711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117915887 - 2⁶ = 117915823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117915857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58957943 + 58957944.

It is an arithmetic number, because the mean of its divisors is an integer number (58957944).

Almost surely, 2^117915887 is an apocalyptic number.

117915887 is a deficient number, since it is larger than the sum of its proper divisors (1).

117915887 is an equidigital number, since it uses as much as digits as its factorization.

117915887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 47.

The square root of 117915887 is about 10858.9081863694. The cubic root of 117915887 is about 490.3702421806.

The spelling of 117915887 in words is "one hundred seventeen million, nine hundred fifteen thousand, eight hundred eighty-seven".