6402631 has 2 divisors, whose sum is σ = 6402632. Its totient is φ = 6402630.

The previous prime is 6402629. The next prime is 6402653. The reversal of 6402631 is 1362046.

It is an a-pointer prime, because the next prime (6402653) can be obtained adding 6402631 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6402631 - 2¹ = 6402629 is a prime.

It is a super-2 number, since 2×6402631² = 81987367444322, which contains 22 as substring.

Together with 6402629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6402661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201315 + 3201316.

It is an arithmetic number, because the mean of its divisors is an integer number (3201316).

Almost surely, 2^6402631 is an apocalyptic number.

6402631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402631 is an equidigital number, since it uses as much as digits as its factorization.

6402631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6402631 is about 2530.3420717365. The cubic root of 6402631 is about 185.6889915678.

Adding to 6402631 its reverse (1362046), we get a palindrome (7764677).

The spelling of 6402631 in words is "six million, four hundred two thousand, six hundred thirty-one".