591421680991 has 2 divisors, whose sum is σ = 591421680992. Its totient is φ = 591421680990.

The previous prime is 591421680979. The next prime is 591421681007. The reversal of 591421680991 is 199086124195.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-591421680991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (591421680961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295710840495 + 295710840496.

It is an arithmetic number, because the mean of its divisors is an integer number (295710840496).

Almost surely, 2^591421680991 is an apocalyptic number.

591421680991 is a deficient number, since it is larger than the sum of its proper divisors (1).

591421680991 is an equidigital number, since it uses as much as digits as its factorization.

591421680991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The spelling of 591421680991 in words is "five hundred ninety-one billion, four hundred twenty-one million, six hundred eighty thousand, nine hundred ninety-one".