6436311491 has 2 divisors, whose sum is σ = 6436311492. Its totient is φ = 6436311490.

The previous prime is 6436311457. The next prime is 6436311493. The reversal of 6436311491 is 1941136346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6436311491 is a prime.

It is a super-2 number, since 2×6436311491² = 82852211218357286162, which contains 22 as substring.

Together with 6436311493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6436311493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3218155745 + 3218155746.

It is an arithmetic number, because the mean of its divisors is an integer number (3218155746).

Almost surely, 2^6436311491 is an apocalyptic number.

6436311491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6436311491 is an equidigital number, since it uses as much as digits as its factorization.

6436311491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 6436311491 is about 80226.6258233512. The cubic root of 6436311491 is about 1860.1402263533.

The spelling of 6436311491 in words is "six billion, four hundred thirty-six million, three hundred eleven thousand, four hundred ninety-one".