5656321 has 16 divisors (see below), whose sum is σ = 6543360. Its totient is φ = 4839120.

The previous prime is 5656307. The next prime is 5656379. The reversal of 5656321 is 1236565.

It is not a de Polignac number, because 5656321 - 2⁷ = 5656193 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5656321.

It is not an unprimeable number, because it can be changed into a prime (5656381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19846 + ... + 20128.

It is an arithmetic number, because the mean of its divisors is an integer number (408960).

Almost surely, 2^5656321 is an apocalyptic number.

It is an amenable number.

5656321 is a deficient number, since it is larger than the sum of its proper divisors (887039).

5656321 is a wasteful number, since it uses less digits than its factorization.

5656321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its digits is 5400, while the sum is 28.

The square root of 5656321 is about 2378.3021254668. The cubic root of 5656321 is about 178.1741446833.

It can be divided in two parts, 565 and 6321, that added together give a palindrome (6886).

The spelling of 5656321 in words is "five million, six hundred fifty-six thousand, three hundred twenty-one".