6641531431 has 2 divisors, whose sum is σ = 6641531432. Its totient is φ = 6641531430.

The previous prime is 6641531363. The next prime is 6641531443. The reversal of 6641531431 is 1341351466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6641531431 - 2²¹ = 6639434279 is a prime.

It is a super-2 number, since 2×6641531431² = 88219879497921815522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641531531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320765715 + 3320765716.

It is an arithmetic number, because the mean of its divisors is an integer number (3320765716).

Almost surely, 2^6641531431 is an apocalyptic number.

6641531431 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641531431 is an equidigital number, since it uses as much as digits as its factorization.

6641531431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 6641531431 is about 81495.5914819937. The cubic root of 6641531431 is about 1879.7037626451.

Adding to 6641531431 its reverse (1341351466), we get a palindrome (7982882897).

The spelling of 6641531431 in words is "six billion, six hundred forty-one million, five hundred thirty-one thousand, four hundred thirty-one".