90799979 has 2 divisors, whose sum is σ = 90799980. Its totient is φ = 90799978.

The previous prime is 90799967. The next prime is 90799981. The reversal of 90799979 is 97999709.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90799979 - 2⁴ = 90799963 is a prime.

Together with 90799981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90799999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45399989 + 45399990.

It is an arithmetic number, because the mean of its divisors is an integer number (45399990).

Almost surely, 2^90799979 is an apocalyptic number.

90799979 is a deficient number, since it is larger than the sum of its proper divisors (1).

90799979 is an equidigital number, since it uses as much as digits as its factorization.

90799979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The square root of 90799979 is about 9528.9022977466. The cubic root of 90799979 is about 449.4643486560.

The spelling of 90799979 in words is "ninety million, seven hundred ninety-nine thousand, nine hundred seventy-nine".