6391401443591 has 2 divisors, whose sum is σ = 6391401443592. Its totient is φ = 6391401443590.

The previous prime is 6391401443561. The next prime is 6391401443611. The reversal of 6391401443591 is 1953441041936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6391401443591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6391401443561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195700721795 + 3195700721796.

It is an arithmetic number, because the mean of its divisors is an integer number (3195700721796).

Almost surely, 2^{6391401443591} is an apocalyptic number.

6391401443591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391401443591 is an equidigital number, since it uses as much as digits as its factorization.

6391401443591 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 50.

The spelling of 6391401443591 in words is "six trillion, three hundred ninety-one billion, four hundred one million, four hundred forty-three thousand, five hundred ninety-one".