85117139 has 2 divisors, whose sum is σ = 85117140. Its totient is φ = 85117138.

The previous prime is 85117121. The next prime is 85117159. The reversal of 85117139 is 93171158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85117139 - 2²⁰ = 84068563 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 85117099 and 85117108.

It is not a weakly prime, because it can be changed into another prime (85117159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42558569 + 42558570.

It is an arithmetic number, because the mean of its divisors is an integer number (42558570).

Almost surely, 2^85117139 is an apocalyptic number.

85117139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85117139 is an equidigital number, since it uses as much as digits as its factorization.

85117139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 35.

The square root of 85117139 is about 9225.8950243323. The cubic root of 85117139 is about 439.8848510663.

The spelling of 85117139 in words is "eighty-five million, one hundred seventeen thousand, one hundred thirty-nine".