90318541421 has 2 divisors, whose sum is σ = 90318541422. Its totient is φ = 90318541420.

The previous prime is 90318541387. The next prime is 90318541441. The reversal of 90318541421 is 12414581309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89454828100 + 863713321 = 299090^2 + 29389^2 .

It is a cyclic number.

It is not a de Polignac number, because 90318541421 - 2¹⁰ = 90318540397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90318541441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45159270710 + 45159270711.

It is an arithmetic number, because the mean of its divisors is an integer number (45159270711).

Almost surely, 2^90318541421 is an apocalyptic number.

It is an amenable number.

90318541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

90318541421 is an equidigital number, since it uses as much as digits as its factorization.

90318541421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 90318541421 in words is "ninety billion, three hundred eighteen million, five hundred forty-one thousand, four hundred twenty-one".