115512139 has 2 divisors, whose sum is σ = 115512140. Its totient is φ = 115512138.

The previous prime is 115512083. The next prime is 115512143. The reversal of 115512139 is 931215511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115512139 is a prime.

It is not a weakly prime, because it can be changed into another prime (115512239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57756069 + 57756070.

It is an arithmetic number, because the mean of its divisors is an integer number (57756070).

Almost surely, 2^115512139 is an apocalyptic number.

115512139 is a deficient number, since it is larger than the sum of its proper divisors (1).

115512139 is an equidigital number, since it uses as much as digits as its factorization.

115512139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 28.

The square root of 115512139 is about 10747.6573726557. The cubic root of 115512139 is about 487.0152291701.

The spelling of 115512139 in words is "one hundred fifteen million, five hundred twelve thousand, one hundred thirty-nine".