85931918 has 8 divisors (see below), whose sum is σ = 129198240. Its totient is φ = 42865840.

The previous prime is 85931917. The next prime is 85931929. The reversal of 85931918 is 81913958.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85931917) 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, 48983 + ... + 50706.

It is an arithmetic number, because the mean of its divisors is an integer number (16149780).

Almost surely, 2^85931918 is an apocalyptic number.

85931918 is a deficient number, since it is larger than the sum of its proper divisors (43266322).

85931918 is a wasteful number, since it uses less digits than its factorization.

85931918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100122.

The product of its digits is 77760, while the sum is 44.

The square root of 85931918 is about 9269.9470332899. The cubic root of 85931918 is about 441.2839870886.

The spelling of 85931918 in words is "eighty-five million, nine hundred thirty-one thousand, nine hundred eighteen".