83931979 has 4 divisors (see below), whose sum is σ = 84251376. Its totient is φ = 83612584.

The previous prime is 83931943. The next prime is 83931983. The reversal of 83931979 is 97913938.

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 83931979 - 2⁷ = 83931851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83931929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159304 + ... + 159829.

It is an arithmetic number, because the mean of its divisors is an integer number (21062844).

Almost surely, 2^83931979 is an apocalyptic number.

83931979 is a deficient number, since it is larger than the sum of its proper divisors (319397).

83931979 is a wasteful number, since it uses less digits than its factorization.

83931979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319396.

The product of its digits is 367416, while the sum is 49.

The square root of 83931979 is about 9161.4397885922. The cubic root of 83931979 is about 437.8336680690.

The spelling of 83931979 in words is "eighty-three million, nine hundred thirty-one thousand, nine hundred seventy-nine".