83979613 has 8 divisors (see below), whose sum is σ = 85779000. Its totient is φ = 82188288.

The previous prime is 83979611. The next prime is 83979617. The reversal of 83979613 is 31697938.

It can be written as a sum of positive squares in 4 ways, for example, as 8602489 + 75377124 = 2933^2 + 8682^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 83979613 - 2¹ = 83979611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83979611) 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 7 ways as a sum of consecutive naturals, for example, 22033 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (10722375).

Almost surely, 2^83979613 is an apocalyptic number.

It is an amenable number.

83979613 is a deficient number, since it is larger than the sum of its proper divisors (1799387).

83979613 is a wasteful number, since it uses less digits than its factorization.

83979613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031.

The product of its digits is 244944, while the sum is 46.

The square root of 83979613 is about 9164.0391203879. The cubic root of 83979613 is about 437.9164804646.

The spelling of 83979613 in words is "eighty-three million, nine hundred seventy-nine thousand, six hundred thirteen".