85690531 has 4 divisors (see below), whose sum is σ = 85758912. Its totient is φ = 85622152.

The previous prime is 85690519. The next prime is 85690547. The reversal of 85690531 is 13509658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13509658 = 2 ⋅6754829.

It is a cyclic number.

It is not a de Polignac number, because 85690531 - 2⁷ = 85690403 is a prime.

It is a super-2 number, since 2×85690531² = 14685734206123922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85690511) 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, 32275 + ... + 34828.

It is an arithmetic number, because the mean of its divisors is an integer number (21439728).

Almost surely, 2^85690531 is an apocalyptic number.

85690531 is a deficient number, since it is larger than the sum of its proper divisors (68381).

85690531 is a wasteful number, since it uses less digits than its factorization.

85690531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68380.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 85690531 is about 9256.9180076308. The cubic root of 85690531 is about 440.8704034191.

The spelling of 85690531 in words is "eighty-five million, six hundred ninety thousand, five hundred thirty-one".