90538979 has 2 divisors, whose sum is σ = 90538980. Its totient is φ = 90538978.

The previous prime is 90538949. The next prime is 90539021. The reversal of 90538979 is 97983509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90538979 - 2²⁰ = 89490403 is a prime.

It is not a weakly prime, because it can be changed into another prime (90538919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45269489 + 45269490.

It is an arithmetic number, because the mean of its divisors is an integer number (45269490).

Almost surely, 2^90538979 is an apocalyptic number.

90538979 is a deficient number, since it is larger than the sum of its proper divisors (1).

90538979 is an equidigital number, since it uses as much as digits as its factorization.

90538979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 90538979 is about 9515.1972654276. The cubic root of 90538979 is about 449.0332810981.

The spelling of 90538979 in words is "ninety million, five hundred thirty-eight thousand, nine hundred seventy-nine".