6645431 has 8 divisors (see below), whose sum is σ = 7201824. Its totient is φ = 6095520.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645431 is 1345466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6645431 - 2¹⁸ = 6383287 is a prime.

It is a super-2 number, since 2×6645431² = 88323506351522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6645394 and 6645403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 3701.

It is an arithmetic number, because the mean of its divisors is an integer number (900228).

Almost surely, 2^6645431 is an apocalyptic number.

6645431 is a deficient number, since it is larger than the sum of its proper divisors (556393).

6645431 is a wasteful number, since it uses less digits than its factorization.

6645431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241.

The product of its digits is 8640, while the sum is 29.

The square root of 6645431 is about 2577.8733483242. The cubic root of 6645431 is about 188.0071579439.

The spelling of 6645431 in words is "six million, six hundred forty-five thousand, four hundred thirty-one".