85731 has 12 divisors (see below), whose sum is σ = 124056. Its totient is φ = 52480.

The previous prime is 85717. The next prime is 85733. The reversal of 85731 is 13758.

It is not a de Polignac number, because 85731 - 2⁶ = 85667 is a prime.

It is a super-2 number, since 2×85731² = 14699608722, which contains 22 as substring.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (85733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2071 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (10338).

2⁸⁵⁷³¹ is an apocalyptic number.

85731 is a deficient number, since it is larger than the sum of its proper divisors (38325).

85731 is a wasteful number, since it uses less digits than its factorization.

85731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 61 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 85731 is about 292.7985655703. The cubic root of 85731 is about 44.0939795670.

It can be divided in two parts, 857 and 31, that added together give a palindrome (888).

The spelling of 85731 in words is "eighty-five thousand, seven hundred thirty-one".