6444631 has 2 divisors, whose sum is σ = 6444632. Its totient is φ = 6444630.

The previous prime is 6444619. The next prime is 6444637. The reversal of 6444631 is 1364446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6444631 - 2²¹ = 4347479 is a prime.

It is a super-2 number, since 2×6444631² = 83066537452322, which contains 22 as substring.

6444631 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6444631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6444637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222315 + 3222316.

It is an arithmetic number, because the mean of its divisors is an integer number (3222316).

Almost surely, 2^6444631 is an apocalyptic number.

6444631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444631 is an equidigital number, since it uses as much as digits as its factorization.

6444631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 6444631 is about 2538.6277789389. The cubic root of 6444631 is about 186.0941347221.

The spelling of 6444631 in words is "six million, four hundred forty-four thousand, six hundred thirty-one".