85631915 has 4 divisors (see below), whose sum is σ = 102758304. Its totient is φ = 68505528.

The previous prime is 85631851. The next prime is 85631957. The reversal of 85631915 is 51913658.

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 85631915 - 2⁶ = 85631851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8563187 + ... + 8563196.

It is an arithmetic number, because the mean of its divisors is an integer number (25689576).

Almost surely, 2^85631915 is an apocalyptic number.

85631915 is a deficient number, since it is larger than the sum of its proper divisors (17126389).

85631915 is a wasteful number, since it uses less digits than its factorization.

85631915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17126388.

The product of its digits is 32400, while the sum is 38.

The square root of 85631915 is about 9253.7514014588. The cubic root of 85631915 is about 440.7698557317.

The spelling of 85631915 in words is "eighty-five million, six hundred thirty-one thousand, nine hundred fifteen".