85611979 has 4 divisors (see below), whose sum is σ = 86397520. Its totient is φ = 84826440.

The previous prime is 85611971. The next prime is 85612019. The reversal of 85611979 is 97911658.

It is a happy number.

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 85611979 - 2³ = 85611971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85611971) 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, 392607 + ... + 392824.

It is an arithmetic number, because the mean of its divisors is an integer number (21599380).

Almost surely, 2^85611979 is an apocalyptic number.

85611979 is a deficient number, since it is larger than the sum of its proper divisors (785541).

85611979 is a wasteful number, since it uses less digits than its factorization.

85611979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785540.

The product of its digits is 136080, while the sum is 46.

The square root of 85611979 is about 9252.6741539946. The cubic root of 85611979 is about 440.7356478087.

The spelling of 85611979 in words is "eighty-five million, six hundred eleven thousand, nine hundred seventy-nine".