90136309 has 2 divisors, whose sum is σ = 90136310. Its totient is φ = 90136308.

The previous prime is 90136297. The next prime is 90136331. The reversal of 90136309 is 90363109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66096900 + 24039409 = 8130^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 90136309 - 2⁹ = 90135797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90130309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45068154 + 45068155.

It is an arithmetic number, because the mean of its divisors is an integer number (45068155).

Almost surely, 2^90136309 is an apocalyptic number.

It is an amenable number.

90136309 is a deficient number, since it is larger than the sum of its proper divisors (1).

90136309 is an equidigital number, since it uses as much as digits as its factorization.

90136309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 90136309 is about 9494.0143774907. The cubic root of 90136309 is about 448.3666034222.

The spelling of 90136309 in words is "ninety million, one hundred thirty-six thousand, three hundred nine".