90479969 has 2 divisors, whose sum is σ = 90479970. Its totient is φ = 90479968.

The previous prime is 90479929. The next prime is 90480023. The reversal of 90479969 is 96997409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69089344 + 21390625 = 8312^2 + 4625^2 .

It is an emirp because it is prime and its reverse (96997409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90479969 - 2⁸ = 90479713 is a prime.

It is a super-2 number, since 2×90479969² = 16373249580481922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90479969.

It is not a weakly prime, because it can be changed into another prime (90479929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45239984 + 45239985.

It is an arithmetic number, because the mean of its divisors is an integer number (45239985).

Almost surely, 2^90479969 is an apocalyptic number.

It is an amenable number.

90479969 is a deficient number, since it is larger than the sum of its proper divisors (1).

90479969 is an equidigital number, since it uses as much as digits as its factorization.

90479969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 90479969 is about 9512.0959309713. The cubic root of 90479969 is about 448.9357053984.

The spelling of 90479969 in words is "ninety million, four hundred seventy-nine thousand, nine hundred sixty-nine".