14591322721 has 2 divisors, whose sum is σ = 14591322722. Its totient is φ = 14591322720.

The previous prime is 14591322719. The next prime is 14591322787. The reversal of 14591322721 is 12722319541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13638736225 + 952586496 = 116785^2 + 30864^2 .

It is a cyclic number.

It is not a de Polignac number, because 14591322721 - 2¹ = 14591322719 is a prime.

Together with 14591322719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (14591322121) 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, 7295661360 + 7295661361.

It is an arithmetic number, because the mean of its divisors is an integer number (7295661361).

Almost surely, 2^14591322721 is an apocalyptic number.

It is an amenable number.

14591322721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14591322721 is an equidigital number, since it uses as much as digits as its factorization.

14591322721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The spelling of 14591322721 in words is "fourteen billion, five hundred ninety-one million, three hundred twenty-two thousand, seven hundred twenty-one".