85307831 has 4 divisors (see below), whose sum is σ = 97494672. Its totient is φ = 73120992.

The previous prime is 85307801. The next prime is 85307863. The reversal of 85307831 is 13870358.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-85307831 is a prime.

It is a super-2 number, since 2×85307831² = 14554852059849122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85307791 and 85307800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85307801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6093410 + ... + 6093423.

It is an arithmetic number, because the mean of its divisors is an integer number (24373668).

Almost surely, 2^85307831 is an apocalyptic number.

85307831 is a deficient number, since it is larger than the sum of its proper divisors (12186841).

85307831 is a wasteful number, since it uses less digits than its factorization.

85307831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12186840.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 85307831 is about 9236.2238496043. The cubic root of 85307831 is about 440.2131044155.

It can be divided in two parts, 8530 and 7831, that added together give a palindrome (16361).

The spelling of 85307831 in words is "eighty-five million, three hundred seven thousand, eight hundred thirty-one".