90365909 has 2 divisors, whose sum is σ = 90365910. Its totient is φ = 90365908.

The previous prime is 90365861. The next prime is 90365963. The reversal of 90365909 is 90956309.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90060100 + 305809 = 9490^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 90365909 - 2¹² = 90361813 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 (90365969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45182954 + 45182955.

It is an arithmetic number, because the mean of its divisors is an integer number (45182955).

Almost surely, 2^90365909 is an apocalyptic number.

It is an amenable number.

90365909 is a deficient number, since it is larger than the sum of its proper divisors (1).

90365909 is an equidigital number, since it uses as much as digits as its factorization.

90365909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 90365909 is about 9506.0985162158. The cubic root of 90365909 is about 448.7469817174.

The spelling of 90365909 in words is "ninety million, three hundred sixty-five thousand, nine hundred nine".