85399973431 has 2 divisors, whose sum is σ = 85399973432. Its totient is φ = 85399973430.

The previous prime is 85399973411. The next prime is 85399973441. The reversal of 85399973431 is 13437999358.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85399973431 - 2⁹ = 85399972919 is a prime.

It is a super-2 number, since 2×85399973431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85399973431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85399973411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42699986715 + 42699986716.

It is an arithmetic number, because the mean of its divisors is an integer number (42699986716).

Almost surely, 2^85399973431 is an apocalyptic number.

85399973431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85399973431 is an equidigital number, since it uses as much as digits as its factorization.

85399973431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22044960, while the sum is 61.

The spelling of 85399973431 in words is "eighty-five billion, three hundred ninety-nine million, nine hundred seventy-three thousand, four hundred thirty-one".