90979939 has 2 divisors, whose sum is σ = 90979940. Its totient is φ = 90979938.

The previous prime is 90979913. The next prime is 90979949. The reversal of 90979939 is 93997909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90979939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90979939.

It is not a weakly prime, because it can be changed into another prime (90979949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45489969 + 45489970.

It is an arithmetic number, because the mean of its divisors is an integer number (45489970).

Almost surely, 2^90979939 is an apocalyptic number.

90979939 is a deficient number, since it is larger than the sum of its proper divisors (1).

90979939 is an equidigital number, since it uses as much as digits as its factorization.

90979939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 90979939 is about 9538.3404741076. The cubic root of 90979939 is about 449.7610896430.

The spelling of 90979939 in words is "ninety million, nine hundred seventy-nine thousand, nine hundred thirty-nine".