85559839931 has 2 divisors, whose sum is σ = 85559839932. Its totient is φ = 85559839930.

The previous prime is 85559839921. The next prime is 85559839951. The reversal of 85559839931 is 13993895558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85559839931 - 2⁶ = 85559839867 is a prime.

It is a super-2 number, since 2×85559839931² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85559839901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42779919965 + 42779919966.

It is an arithmetic number, because the mean of its divisors is an integer number (42779919966).

Almost surely, 2^85559839931 is an apocalyptic number.

85559839931 is a deficient number, since it is larger than the sum of its proper divisors (1).

85559839931 is an equidigital number, since it uses as much as digits as its factorization.

85559839931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488000, while the sum is 65.

The spelling of 85559839931 in words is "eighty-five billion, five hundred fifty-nine million, eight hundred thirty-nine thousand, nine hundred thirty-one".