117855139 has 2 divisors, whose sum is σ = 117855140. Its totient is φ = 117855138.

The previous prime is 117855137. The next prime is 117855167. The reversal of 117855139 is 931558711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117855139 - 2¹ = 117855137 is a prime.

Together with 117855137, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (117855137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58927569 + 58927570.

It is an arithmetic number, because the mean of its divisors is an integer number (58927570).

Almost surely, 2^117855139 is an apocalyptic number.

117855139 is a deficient number, since it is larger than the sum of its proper divisors (1).

117855139 is an equidigital number, since it uses as much as digits as its factorization.

117855139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 40.

The square root of 117855139 is about 10856.1106755596. The cubic root of 117855139 is about 490.2860179389.

The spelling of 117855139 in words is "one hundred seventeen million, eight hundred fifty-five thousand, one hundred thirty-nine".