90422610721 has 2 divisors, whose sum is σ = 90422610722. Its totient is φ = 90422610720.

The previous prime is 90422610697. The next prime is 90422610727. The reversal of 90422610721 is 12701622409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61325074321 + 29097536400 = 247639^2 + 170580^2 .

It is a cyclic number.

It is not a de Polignac number, because 90422610721 - 2²¹ = 90420513569 is a prime.

It is not a weakly prime, because it can be changed into another prime (90422610727) 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, 45211305360 + 45211305361.

It is an arithmetic number, because the mean of its divisors is an integer number (45211305361).

Almost surely, 2^90422610721 is an apocalyptic number.

It is an amenable number.

90422610721 is a deficient number, since it is larger than the sum of its proper divisors (1).

90422610721 is an equidigital number, since it uses as much as digits as its factorization.

90422610721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 90422610721 in words is "ninety billion, four hundred twenty-two million, six hundred ten thousand, seven hundred twenty-one".