6438531 has 12 divisors (see below), whose sum is σ = 9436616. Its totient is φ = 3901920.

The previous prime is 6438463. The next prime is 6438539. The reversal of 6438531 is 1358346.

It is not a de Polignac number, because 6438531 - 2⁷ = 6438403 is a prime.

It is a super-2 number, since 2×6438531² = 82909362875922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438539) 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 in 11 ways as a sum of consecutive naturals, for example, 8506 + ... + 9231.

Almost surely, 2^6438531 is an apocalyptic number.

6438531 is a deficient number, since it is larger than the sum of its proper divisors (2998085).

6438531 is a wasteful number, since it uses less digits than its factorization.

6438531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17762 (or 17751 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 6438531 is about 2537.4260580360. The cubic root of 6438531 is about 186.0354019792.

The spelling of 6438531 in words is "six million, four hundred thirty-eight thousand, five hundred thirty-one".