641413631 has 2 divisors, whose sum is σ = 641413632. Its totient is φ = 641413630.

The previous prime is 641413601. The next prime is 641413687. The reversal of 641413631 is 136314146.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641413631 is a prime.

It is a super-2 number, since 2×641413631² = 822822892065208322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 641413594 and 641413603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641413601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320706815 + 320706816.

It is an arithmetic number, because the mean of its divisors is an integer number (320706816).

Almost surely, 2^641413631 is an apocalyptic number.

641413631 is a deficient number, since it is larger than the sum of its proper divisors (1).

641413631 is an equidigital number, since it uses as much as digits as its factorization.

641413631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 641413631 is about 25326.1452060909. The cubic root of 641413631 is about 862.4079043583.

Adding to 641413631 its reverse (136314146), we get a palindrome (777727777).

The spelling of 641413631 in words is "six hundred forty-one million, four hundred thirteen thousand, six hundred thirty-one".