117908521 has 2 divisors, whose sum is σ = 117908522. Its totient is φ = 117908520.

The previous prime is 117908507. The next prime is 117908551. The reversal of 117908521 is 125809711.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87216921 + 30691600 = 9339^2 + 5540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117908521 is a prime.

It is not a weakly prime, because it can be changed into another prime (117908551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58954260 + 58954261.

It is an arithmetic number, because the mean of its divisors is an integer number (58954261).

Almost surely, 2^117908521 is an apocalyptic number.

It is an amenable number.

117908521 is a deficient number, since it is larger than the sum of its proper divisors (1).

117908521 is an equidigital number, since it uses as much as digits as its factorization.

117908521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 117908521 is about 10858.5690125357. The cubic root of 117908521 is about 490.3600311098.

The spelling of 117908521 in words is "one hundred seventeen million, nine hundred eight thousand, five hundred twenty-one".