6642631 has 4 divisors (see below), whose sum is σ = 7033392. Its totient is φ = 6251872.

The previous prime is 6642619. The next prime is 6642637. The reversal of 6642631 is 1362466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6642631 - 2¹⁷ = 6511559 is a prime.

It is a super-2 number, since 2×6642631² = 88249093204322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6642631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195355 + ... + 195388.

It is an arithmetic number, because the mean of its divisors is an integer number (1758348).

Almost surely, 2^6642631 is an apocalyptic number.

6642631 is a deficient number, since it is larger than the sum of its proper divisors (390761).

6642631 is a wasteful number, since it uses less digits than its factorization.

6642631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390760.

The product of its digits is 5184, while the sum is 28.

The square root of 6642631 is about 2577.3302077926. The cubic root of 6642631 is about 187.9807491228.

The spelling of 6642631 in words is "six million, six hundred forty-two thousand, six hundred thirty-one".