2556506 has 4 divisors (see below), whose sum is σ = 3834762. Its totient is φ = 1278252.

The previous prime is 2556503. The next prime is 2556509. The reversal of 2556506 is 6056552.

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

It is an interprime number because it is at equal distance from previous prime (2556503) and next prime (2556509).

It can be written as a sum of positive squares in only one way, i.e., 2430481 + 126025 = 1559^2 + 355^2 .

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 as a sum of consecutive naturals, namely, 639125 + ... + 639128.

2^2556506 is an apocalyptic number.

2556506 is a deficient number, since it is larger than the sum of its proper divisors (1278256).

2556506 is a wasteful number, since it uses less digits than its factorization.

2556506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278255.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2556506 is about 1598.9077521858. The cubic root of 2556506 is about 136.7358113989.

The spelling of 2556506 in words is "two million, five hundred fifty-six thousand, five hundred six".