85690139 has 2 divisors, whose sum is σ = 85690140. Its totient is φ = 85690138.

The previous prime is 85690103. The next prime is 85690153. The reversal of 85690139 is 93109658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85690139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85690096 and 85690105.

It is not a weakly prime, because it can be changed into another prime (85690159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42845069 + 42845070.

It is an arithmetic number, because the mean of its divisors is an integer number (42845070).

Almost surely, 2^85690139 is an apocalyptic number.

85690139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85690139 is an equidigital number, since it uses as much as digits as its factorization.

85690139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 85690139 is about 9256.8968342528. The cubic root of 85690139 is about 440.8697311493.

The spelling of 85690139 in words is "eighty-five million, six hundred ninety thousand, one hundred thirty-nine".