83979901 has 2 divisors, whose sum is σ = 83979902. Its totient is φ = 83979900.

The previous prime is 83979887. The next prime is 83979979. The reversal of 83979901 is 10997938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82791801 + 1188100 = 9099^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 83979901 - 2⁷ = 83979773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83974901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41989950 + 41989951.

It is an arithmetic number, because the mean of its divisors is an integer number (41989951).

Almost surely, 2^83979901 is an apocalyptic number.

It is an amenable number.

83979901 is a deficient number, since it is larger than the sum of its proper divisors (1).

83979901 is an equidigital number, since it uses as much as digits as its factorization.

83979901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 83979901 is about 9164.0548339695. The cubic root of 83979901 is about 437.9169810615.

The spelling of 83979901 in words is "eighty-three million, nine hundred seventy-nine thousand, nine hundred one".