90017969 has 2 divisors, whose sum is σ = 90017970. Its totient is φ = 90017968.

The previous prime is 90017959. The next prime is 90017971. The reversal of 90017969 is 96971009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 620944 = 9455^2 + 788^2 .

It is a cyclic number.

It is not a de Polignac number, because 90017969 - 2¹⁶ = 89952433 is a prime.

It is a super-2 number, since 2×90017969² = 16206469485769922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 90017971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90017959) 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, 45008984 + 45008985.

It is an arithmetic number, because the mean of its divisors is an integer number (45008985).

Almost surely, 2^90017969 is an apocalyptic number.

It is an amenable number.

90017969 is a deficient number, since it is larger than the sum of its proper divisors (1).

90017969 is an equidigital number, since it uses as much as digits as its factorization.

90017969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 90017969 is about 9487.7799826935. The cubic root of 90017969 is about 448.1702972495.

The spelling of 90017969 in words is "ninety million, seventeen thousand, nine hundred sixty-nine".