90990479 has 2 divisors, whose sum is σ = 90990480. Its totient is φ = 90990478.

The previous prime is 90990469. The next prime is 90990503. The reversal of 90990479 is 97409909.

It is a weak prime.

It is an emirp because it is prime and its reverse (97409909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90990479 - 2²⁰ = 89941903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90990469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45495239 + 45495240.

It is an arithmetic number, because the mean of its divisors is an integer number (45495240).

Almost surely, 2^90990479 is an apocalyptic number.

90990479 is a deficient number, since it is larger than the sum of its proper divisors (1).

90990479 is an equidigital number, since it uses as much as digits as its factorization.

90990479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 90990479 is about 9538.8929651192. The cubic root of 90990479 is about 449.7784572037.

The spelling of 90990479 in words is "ninety million, nine hundred ninety thousand, four hundred seventy-nine".