90850497817 has 2 divisors, whose sum is σ = 90850497818. Its totient is φ = 90850497816.

The previous prime is 90850497809. The next prime is 90850497853. The reversal of 90850497817 is 71879405809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84292089561 + 6558408256 = 290331^2 + 80984^2 .

It is a cyclic number.

It is not a de Polignac number, because 90850497817 - 2³ = 90850497809 is a prime.

It is not a weakly prime, because it can be changed into another prime (90850497217) 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, 45425248908 + 45425248909.

It is an arithmetic number, because the mean of its divisors is an integer number (45425248909).

Almost surely, 2^90850497817 is an apocalyptic number.

It is an amenable number.

90850497817 is a deficient number, since it is larger than the sum of its proper divisors (1).

90850497817 is an equidigital number, since it uses as much as digits as its factorization.

90850497817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 90850497817 in words is "ninety billion, eight hundred fifty million, four hundred ninety-seven thousand, eight hundred seventeen".