85613531 has 4 divisors (see below), whose sum is σ = 85777752. Its totient is φ = 85449312.

The previous prime is 85613509. The next prime is 85613551. The reversal of 85613531 is 13531658.

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

It is a cyclic number.

It is not a de Polignac number, because 85613531 - 2⁶ = 85613467 is a prime.

It is a super-2 number, since 2×85613531² = 14659353380575922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85613501) 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, 81326 + ... + 82371.

It is an arithmetic number, because the mean of its divisors is an integer number (21444438).

Almost surely, 2^85613531 is an apocalyptic number.

85613531 is a deficient number, since it is larger than the sum of its proper divisors (164221).

85613531 is a wasteful number, since it uses less digits than its factorization.

85613531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164220.

The product of its digits is 10800, while the sum is 32.

The square root of 85613531 is about 9252.7580212605. The cubic root of 85613531 is about 440.7383110560.

The spelling of 85613531 in words is "eighty-five million, six hundred thirteen thousand, five hundred thirty-one".