90089846221 has 2 divisors, whose sum is σ = 90089846222. Its totient is φ = 90089846220.

The previous prime is 90089846177. The next prime is 90089846239. The reversal of 90089846221 is 12264898009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49845474121 + 40244372100 = 223261^2 + 200610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90089846221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90089846521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45044923110 + 45044923111.

It is an arithmetic number, because the mean of its divisors is an integer number (45044923111).

Almost surely, 2^90089846221 is an apocalyptic number.

It is an amenable number.

90089846221 is a deficient number, since it is larger than the sum of its proper divisors (1).

90089846221 is an equidigital number, since it uses as much as digits as its factorization.

90089846221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 90089846221 in words is "ninety billion, eighty-nine million, eight hundred forty-six thousand, two hundred twenty-one".