90242309 has 2 divisors, whose sum is σ = 90242310. Its totient is φ = 90242308.

The previous prime is 90242293. The next prime is 90242359. The reversal of 90242309 is 90324209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 23493409 = 8170^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 90242309 - 2⁴ = 90242293 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 (90242359) 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, 45121154 + 45121155.

It is an arithmetic number, because the mean of its divisors is an integer number (45121155).

Almost surely, 2^90242309 is an apocalyptic number.

It is an amenable number.

90242309 is a deficient number, since it is larger than the sum of its proper divisors (1).

90242309 is an equidigital number, since it uses as much as digits as its factorization.

90242309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 90242309 is about 9499.5952019020. The cubic root of 90242309 is about 448.5422937819.

The spelling of 90242309 in words is "ninety million, two hundred forty-two thousand, three hundred nine".