6648431 has 2 divisors, whose sum is σ = 6648432. Its totient is φ = 6648430.

The previous prime is 6648413. The next prime is 6648457. The reversal of 6648431 is 1348466.

Together with previous prime (6648413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6648431 is a prime.

It is a super-2 number, since 2×6648431² = 88403269523522, which contains 22 as substring.

It is a Sophie Germain prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6648401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324215 + 3324216.

It is an arithmetic number, because the mean of its divisors is an integer number (3324216).

Almost surely, 2^6648431 is an apocalyptic number.

6648431 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648431 is an equidigital number, since it uses as much as digits as its factorization.

6648431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 6648431 is about 2578.4551576477. The cubic root of 6648431 is about 188.0354448787.

The spelling of 6648431 in words is "six million, six hundred forty-eight thousand, four hundred thirty-one".