83971021619 has 2 divisors, whose sum is σ = 83971021620. Its totient is φ = 83971021618.

The previous prime is 83971021579. The next prime is 83971021639. The reversal of 83971021619 is 91612017938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83971021619 - 2⁸ = 83971021363 is a prime.

It is a super-2 number, since 2×83971021619² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (83971021639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41985510809 + 41985510810.

It is an arithmetic number, because the mean of its divisors is an integer number (41985510810).

Almost surely, 2^83971021619 is an apocalyptic number.

83971021619 is a deficient number, since it is larger than the sum of its proper divisors (1).

83971021619 is an equidigital number, since it uses as much as digits as its factorization.

83971021619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 83971021619 in words is "eighty-three billion, nine hundred seventy-one million, twenty-one thousand, six hundred nineteen".