90300850921 has 2 divisors, whose sum is σ = 90300850922. Its totient is φ = 90300850920.

The previous prime is 90300850889. The next prime is 90300851071. The reversal of 90300850921 is 12905800309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84558242521 + 5742608400 = 290789^2 + 75780^2 .

It is a cyclic number.

It is not a de Polignac number, because 90300850921 - 2⁵ = 90300850889 is a prime.

It is not a weakly prime, because it can be changed into another prime (90300850021) 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, 45150425460 + 45150425461.

It is an arithmetic number, because the mean of its divisors is an integer number (45150425461).

Almost surely, 2^90300850921 is an apocalyptic number.

It is an amenable number.

90300850921 is a deficient number, since it is larger than the sum of its proper divisors (1).

90300850921 is an equidigital number, since it uses as much as digits as its factorization.

90300850921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 90300850921 in words is "ninety billion, three hundred million, eight hundred fifty thousand, nine hundred twenty-one".