117908551 has 2 divisors, whose sum is σ = 117908552. Its totient is φ = 117908550.

The previous prime is 117908521. The next prime is 117908573. The reversal of 117908551 is 155809711.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117908551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117908551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117908521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58954275 + 58954276.

It is an arithmetic number, because the mean of its divisors is an integer number (58954276).

Almost surely, 2^117908551 is an apocalyptic number.

117908551 is a deficient number, since it is larger than the sum of its proper divisors (1).

117908551 is an equidigital number, since it uses as much as digits as its factorization.

117908551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 117908551 is about 10858.5703939331. The cubic root of 117908551 is about 490.3600726980.

The spelling of 117908551 in words is "one hundred seventeen million, nine hundred eight thousand, five hundred fifty-one".