85531 has 2 divisors, whose sum is σ = 85532. Its totient is φ = 85530.

The previous prime is 85523. The next prime is 85549. The reversal of 85531 is 13558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85531 - 2³ = 85523 is a prime.

It is a super-2 number, since 2×85531² = 14631103922, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (85571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42765 + 42766.

It is an arithmetic number, because the mean of its divisors is an integer number (42766).

2⁸⁵⁵³¹ is an apocalyptic number.

85531 is a deficient number, since it is larger than the sum of its proper divisors (1).

85531 is an equidigital number, since it uses as much as digits as its factorization.

85531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 85531 is about 292.4568344218. The cubic root of 85531 is about 44.0596642375.

It can be divided in two parts, 85 and 531, that added together give a palindrome (616).

The spelling of 85531 in words is "eighty-five thousand, five hundred thirty-one".