6431511736493 has 2 divisors, whose sum is σ = 6431511736494. Its totient is φ = 6431511736492.

The previous prime is 6431511736451. The next prime is 6431511736577. The reversal of 6431511736493 is 3946371151346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5897330547364 + 534181189129 = 2428442^2 + 730877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6431511736493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6431511736193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215755868246 + 3215755868247.

It is an arithmetic number, because the mean of its divisors is an integer number (3215755868247).

Almost surely, 2^{6431511736493} is an apocalyptic number.

It is an amenable number.

6431511736493 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431511736493 is an equidigital number, since it uses as much as digits as its factorization.

6431511736493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The spelling of 6431511736493 in words is "six trillion, four hundred thirty-one billion, five hundred eleven million, seven hundred thirty-six thousand, four hundred ninety-three".