90983209 has 2 divisors, whose sum is σ = 90983210. Its totient is φ = 90983208.

The previous prime is 90983197. The next prime is 90983219. The reversal of 90983209 is 90238909.

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., 57805609 + 33177600 = 7603^2 + 5760^2 .

It is a cyclic number.

It is not a de Polignac number, because 90983209 - 2¹⁷ = 90852137 is a prime.

It is not a weakly prime, because it can be changed into another prime (90983219) 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, 45491604 + 45491605.

It is an arithmetic number, because the mean of its divisors is an integer number (45491605).

Almost surely, 2^90983209 is an apocalyptic number.

It is an amenable number.

90983209 is a deficient number, since it is larger than the sum of its proper divisors (1).

90983209 is an equidigital number, since it uses as much as digits as its factorization.

90983209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 90983209 is about 9538.5118860334. The cubic root of 90983209 is about 449.7664780145.

The spelling of 90983209 in words is "ninety million, nine hundred eighty-three thousand, two hundred nine".