591064738921 has 2 divisors, whose sum is σ = 591064738922. Its totient is φ = 591064738920.

The previous prime is 591064738853. The next prime is 591064739033. The reversal of 591064738921 is 129837460195.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582987223296 + 8077515625 = 763536^2 + 89875^2 .

It is a cyclic number.

It is not a de Polignac number, because 591064738921 - 2⁹ = 591064738409 is a prime.

It is not a weakly prime, because it can be changed into another prime (591064708921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295532369460 + 295532369461.

It is an arithmetic number, because the mean of its divisors is an integer number (295532369461).

It is a 1-persistent number, because it is pandigital, but 2⋅591064738921 = 1182129477842 is not.

Almost surely, 2^591064738921 is an apocalyptic number.

It is an amenable number.

591064738921 is a deficient number, since it is larger than the sum of its proper divisors (1).

591064738921 is an equidigital number, since it uses as much as digits as its factorization.

591064738921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 591064738921 in words is "five hundred ninety-one billion, sixty-four million, seven hundred thirty-eight thousand, nine hundred twenty-one".