117561139 has 2 divisors, whose sum is σ = 117561140. Its totient is φ = 117561138.

The previous prime is 117561131. The next prime is 117561163. The reversal of 117561139 is 931165711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117561139 - 2³ = 117561131 is a prime.

It is not a weakly prime, because it can be changed into another prime (117561131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58780569 + 58780570.

It is an arithmetic number, because the mean of its divisors is an integer number (58780570).

Almost surely, 2^117561139 is an apocalyptic number.

117561139 is a deficient number, since it is larger than the sum of its proper divisors (1).

117561139 is an equidigital number, since it uses as much as digits as its factorization.

117561139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 34.

The square root of 117561139 is about 10842.5614593601. The cubic root of 117561139 is about 489.8779912803.

The spelling of 117561139 in words is "one hundred seventeen million, five hundred sixty-one thousand, one hundred thirty-nine".