90393228481 has 2 divisors, whose sum is σ = 90393228482. Its totient is φ = 90393228480.

The previous prime is 90393228469. The next prime is 90393228553. The reversal of 90393228481 is 18482239309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90365770881 + 27457600 = 300609^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 90393228481 - 2⁷ = 90393228353 is a prime.

It is a super-2 number, since 2×90393228481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90393228451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45196614240 + 45196614241.

It is an arithmetic number, because the mean of its divisors is an integer number (45196614241).

Almost surely, 2^90393228481 is an apocalyptic number.

It is an amenable number.

90393228481 is a deficient number, since it is larger than the sum of its proper divisors (1).

90393228481 is an equidigital number, since it uses as much as digits as its factorization.

90393228481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 90393228481 in words is "ninety billion, three hundred ninety-three million, two hundred twenty-eight thousand, four hundred eighty-one".