2556321 has 8 divisors (see below), whose sum is σ = 3526080. Its totient is φ = 1645392.

The previous prime is 2556277. The next prime is 2556331. The reversal of 2556321 is 1236552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2556321 - 2⁷ = 2556193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2556291 and 2556300.

It is not an unprimeable number, because it can be changed into a prime (2556331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14605 + ... + 14778.

It is an arithmetic number, because the mean of its divisors is an integer number (440760).

2^2556321 is an apocalyptic number.

It is an amenable number.

2556321 is a deficient number, since it is larger than the sum of its proper divisors (969759).

2556321 is a wasteful number, since it uses less digits than its factorization.

2556321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29415.

The product of its digits is 1800, while the sum is 24.

The square root of 2556321 is about 1598.8498991463. The cubic root of 2556321 is about 136.7325130515.

The spelling of 2556321 in words is "two million, five hundred fifty-six thousand, three hundred twenty-one".