85729139 has 2 divisors, whose sum is σ = 85729140. Its totient is φ = 85729138.

The previous prime is 85729109. The next prime is 85729157. The reversal of 85729139 is 93192758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85729139 - 2⁸ = 85728883 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85729139.

It is not a weakly prime, because it can be changed into another prime (85729109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42864569 + 42864570.

It is an arithmetic number, because the mean of its divisors is an integer number (42864570).

Almost surely, 2^85729139 is an apocalyptic number.

85729139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85729139 is an equidigital number, since it uses as much as digits as its factorization.

85729139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 85729139 is about 9259.0031320872. The cubic root of 85729139 is about 440.9366050895.

The spelling of 85729139 in words is "eighty-five million, seven hundred twenty-nine thousand, one hundred thirty-nine".