85131 has 10 divisors (see below), whose sum is σ = 127292. Its totient is φ = 56700.

The previous prime is 85121. The next prime is 85133. The reversal of 85131 is 13158.

It is a happy number.

It is not a de Polignac number, because 85131 - 2¹⁵ = 52363 is a prime.

It is a super-2 number, since 2×85131² = 14494574322, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 85131.

It is not an unprimeable number, because it can be changed into a prime (85133) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 445 + ... + 606.

2⁸⁵¹³¹ is an apocalyptic number.

85131 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

85131 is a deficient number, since it is larger than the sum of its proper divisors (42161).

85131 is a wasteful number, since it uses less digits than its factorization.

85131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1054 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 85131 is about 291.7721713941. The cubic root of 85131 is about 43.9908727624.

Adding to 85131 its reverse (13158), we get a palindrome (98289).

It can be divided in two parts, 85 and 131, that added together give a cube (216 = 6³).

The spelling of 85131 in words is "eighty-five thousand, one hundred thirty-one".