2556215 has 4 divisors (see below), whose sum is σ = 3067464. Its totient is φ = 2044968.

The previous prime is 2556193. The next prime is 2556217. The reversal of 2556215 is 5126552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556215 - 2¹⁰ = 2555191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255617 + ... + 255626.

It is an arithmetic number, because the mean of its divisors is an integer number (766866).

2^2556215 is an apocalyptic number.

2556215 is a deficient number, since it is larger than the sum of its proper divisors (511249).

2556215 is an equidigital number, since it uses as much as digits as its factorization.

2556215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511248.

The product of its digits is 3000, while the sum is 26.

The square root of 2556215 is about 1598.8167499748. The cubic root of 2556215 is about 136.7306231158.

The spelling of 2556215 in words is "two million, five hundred fifty-six thousand, two hundred fifteen".