6645231 has 12 divisors (see below), whose sum is σ = 10104120. Its totient is φ = 4196880.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645231 is 1325466.

It is not a de Polignac number, because 6645231 - 2² = 6645227 is a prime.

It is a super-2 number, since 2×6645231² = 88318190086722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6645195 and 6645204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19260 + ... + 19601.

It is an arithmetic number, because the mean of its divisors is an integer number (842010).

Almost surely, 2^6645231 is an apocalyptic number.

6645231 is a deficient number, since it is larger than the sum of its proper divisors (3458889).

6645231 is a wasteful number, since it uses less digits than its factorization.

6645231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38886 (or 38883 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 6645231 is about 2577.8345563670. The cubic root of 6645231 is about 188.0052718455.

The spelling of 6645231 in words is "six million, six hundred forty-five thousand, two hundred thirty-one".