85931531 has 16 divisors (see below), whose sum is σ = 101122560. Its totient is φ = 71488320.

The previous prime is 85931479. The next prime is 85931537. The reversal of 85931531 is 13513958.

It is a cyclic number.

It is not a de Polignac number, because 85931531 - 2⁶ = 85931467 is a prime.

It is a super-2 number, since 2×85931531² = 14768456040007922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85931491 and 85931500.

It is not an unprimeable number, because it can be changed into a prime (85931537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64490 + ... + 65808.

It is an arithmetic number, because the mean of its divisors is an integer number (6320160).

Almost surely, 2^85931531 is an apocalyptic number.

85931531 is a deficient number, since it is larger than the sum of its proper divisors (15191029).

85931531 is a wasteful number, since it uses less digits than its factorization.

85931531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594.

The product of its digits is 16200, while the sum is 35.

The square root of 85931531 is about 9269.9261593607. The cubic root of 85931531 is about 441.2833246372.

The spelling of 85931531 in words is "eighty-five million, nine hundred thirty-one thousand, five hundred thirty-one".