2556505 has 8 divisors (see below), whose sum is σ = 3506112. Its totient is φ = 1753008.

The previous prime is 2556503. The next prime is 2556509. The reversal of 2556505 is 5056552.

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 2556505 - 2¹ = 2556503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556503) 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, 36487 + ... + 36556.

It is an arithmetic number, because the mean of its divisors is an integer number (438264).

2^2556505 is an apocalyptic number.

It is an amenable number.

2556505 is a deficient number, since it is larger than the sum of its proper divisors (949607).

2556505 is an equidigital number, since it uses as much as digits as its factorization.

2556505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73055.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 2556505 is about 1598.9074394723. The cubic root of 2556505 is about 136.7357935705.

The spelling of 2556505 in words is "two million, five hundred fifty-six thousand, five hundred five".