85637431 has 16 divisors (see below), whose sum is σ = 96795648. Its totient is φ = 75090400.

The previous prime is 85637417. The next prime is 85637459. The reversal of 85637431 is 13473658.

It is not a de Polignac number, because 85637431 - 2⁵ = 85637399 is a prime.

It is a super-2 number, since 2×85637431² = 14667539176559522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85637401) 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, 35541 + ... + 37873.

It is an arithmetic number, because the mean of its divisors is an integer number (6049728).

Almost surely, 2^85637431 is an apocalyptic number.

85637431 is a deficient number, since it is larger than the sum of its proper divisors (11158217).

85637431 is a wasteful number, since it uses less digits than its factorization.

85637431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462.

The product of its digits is 60480, while the sum is 37.

The square root of 85637431 is about 9254.0494379488. The cubic root of 85637431 is about 440.7793196266.

It can be divided in two parts, 85637 and 431, that added together give a palindrome (86068).

The spelling of 85637431 in words is "eighty-five million, six hundred thirty-seven thousand, four hundred thirty-one".