83971021579 has 2 divisors, whose sum is σ = 83971021580. Its totient is φ = 83971021578.

The previous prime is 83971021573. The next prime is 83971021619. The reversal of 83971021579 is 97512017938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83971021579 - 2³ = 83971021571 is a prime.

It is a super-2 number, since 2×83971021579² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83971021571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41985510789 + 41985510790.

It is an arithmetic number, because the mean of its divisors is an integer number (41985510790).

Almost surely, 2^83971021579 is an apocalyptic number.

83971021579 is a deficient number, since it is larger than the sum of its proper divisors (1).

83971021579 is an equidigital number, since it uses as much as digits as its factorization.

83971021579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 83971021579 in words is "eighty-three billion, nine hundred seventy-one million, twenty-one thousand, five hundred seventy-nine".