84579931 has 4 divisors (see below), whose sum is σ = 86379552. Its totient is φ = 82780312.

The previous prime is 84579899. The next prime is 84579941. The reversal of 84579931 is 13997548.

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 84579931 - 2⁵ = 84579899 is a prime.

It is a super-2 number, since 2×84579931² = 14307529455929522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84579941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899740 + ... + 899833.

It is an arithmetic number, because the mean of its divisors is an integer number (21594888).

Almost surely, 2^84579931 is an apocalyptic number.

84579931 is a deficient number, since it is larger than the sum of its proper divisors (1799621).

84579931 is a wasteful number, since it uses less digits than its factorization.

84579931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799620.

The product of its digits is 272160, while the sum is 46.

The square root of 84579931 is about 9196.7348010041. The cubic root of 84579931 is about 438.9574680802.

The spelling of 84579931 in words is "eighty-four million, five hundred seventy-nine thousand, nine hundred thirty-one".