6656431 has 8 divisors (see below), whose sum is σ = 6782384. Its totient is φ = 6531840.

The previous prime is 6656393. The next prime is 6656437. The reversal of 6656431 is 1346566.

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 6656431 - 2⁹ = 6655919 is a prime.

It is a super-2 number, since 2×6656431² = 88616147315522, 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 = 6656393 and 6656402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15601 + ... + 16021.

It is an arithmetic number, because the mean of its divisors is an integer number (847798).

Almost surely, 2^6656431 is an apocalyptic number.

6656431 is a deficient number, since it is larger than the sum of its proper divisors (125953).

6656431 is a wasteful number, since it uses less digits than its factorization.

6656431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its digits is 12960, while the sum is 31.

The square root of 6656431 is about 2580.0060077449. The cubic root of 6656431 is about 188.1108351273.

Subtracting from 6656431 its sum of digits (31), we obtain a square (6656400 = 2580²).

The spelling of 6656431 in words is "six million, six hundred fifty-six thousand, four hundred thirty-one".