6645031 has 4 divisors (see below), whose sum is σ = 6874200. Its totient is φ = 6415864.

The previous prime is 6645019. The next prime is 6645047. The reversal of 6645031 is 1305466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1305466 = 2 ⋅652733.

It is a cyclic number.

It is not a de Polignac number, because 6645031 - 2⁷ = 6644903 is a prime.

It is a super-2 number, since 2×6645031² = 88312873981922, 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 = 6644987 and 6645005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645071) 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, 114541 + ... + 114598.

It is an arithmetic number, because the mean of its divisors is an integer number (1718550).

Almost surely, 2^6645031 is an apocalyptic number.

6645031 is a deficient number, since it is larger than the sum of its proper divisors (229169).

6645031 is a wasteful number, since it uses less digits than its factorization.

6645031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229168.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 6645031 is about 2577.7957638261. The cubic root of 6645031 is about 188.0033857094.

The spelling of 6645031 in words is "six million, six hundred forty-five thousand, thirty-one".