90985801589 has 2 divisors, whose sum is σ = 90985801590. Its totient is φ = 90985801588.

The previous prime is 90985801579. The next prime is 90985801601. The reversal of 90985801589 is 98510858909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83299772689 + 7686028900 = 288617^2 + 87670^2 .

It is a cyclic number.

It is not a de Polignac number, because 90985801589 - 2²⁸ = 90717366133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90985801579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45492900794 + 45492900795.

It is an arithmetic number, because the mean of its divisors is an integer number (45492900795).

Almost surely, 2^90985801589 is an apocalyptic number.

It is an amenable number.

90985801589 is a deficient number, since it is larger than the sum of its proper divisors (1).

90985801589 is an equidigital number, since it uses as much as digits as its factorization.

90985801589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 62.

The spelling of 90985801589 in words is "ninety billion, nine hundred eighty-five million, eight hundred one thousand, five hundred eighty-nine".