83979997 has 2 divisors, whose sum is σ = 83979998. Its totient is φ = 83979996.

The previous prime is 83979979. The next prime is 83980021. The reversal of 83979997 is 79997938.

Together with previous prime (83979979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82700836 + 1279161 = 9094^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 83979997 - 2²³ = 75591389 is a prime.

It is a super-2 number, since 2×83979997² = 14105279792240018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83979097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41989998 + 41989999.

It is an arithmetic number, because the mean of its divisors is an integer number (41989999).

Almost surely, 2^83979997 is an apocalyptic number.

It is an amenable number.

83979997 is a deficient number, since it is larger than the sum of its proper divisors (1).

83979997 is an equidigital number, since it uses as much as digits as its factorization.

83979997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The square root of 83979997 is about 9164.0600718241. The cubic root of 83979997 is about 437.9171479269.

The spelling of 83979997 in words is "eighty-three million, nine hundred seventy-nine thousand, nine hundred ninety-seven".