6631439 has 4 divisors (see below), whose sum is σ = 6636624. Its totient is φ = 6626256.

The previous prime is 6631421. The next prime is 6631447. The reversal of 6631439 is 9341366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9341366 = 2 ⋅4670683.

It is a cyclic number.

It is not a de Polignac number, because 6631439 - 2¹² = 6627343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631409) 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, 854 + ... + 3740.

It is an arithmetic number, because the mean of its divisors is an integer number (1659156).

Almost surely, 2^6631439 is an apocalyptic number.

6631439 is a deficient number, since it is larger than the sum of its proper divisors (5185).

6631439 is a wasteful number, since it uses less digits than its factorization.

6631439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5184.

The product of its digits is 11664, while the sum is 32.

The square root of 6631439 is about 2575.1580534018. The cubic root of 6631439 is about 187.8751151131.

The spelling of 6631439 in words is "six million, six hundred thirty-one thousand, four hundred thirty-nine".