2556609 has 12 divisors (see below), whose sum is σ = 3747408. Its totient is φ = 1549240.

The previous prime is 2556607. The next prime is 2556641. The reversal of 2556609 is 9066552.

It is not a de Polignac number, because 2556609 - 2¹ = 2556607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556609.

It is not an unprimeable number, because it can be changed into a prime (2556607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3159 + ... + 3884.

It is an arithmetic number, because the mean of its divisors is an integer number (312284).

2^2556609 is an apocalyptic number.

It is an amenable number.

2556609 is a deficient number, since it is larger than the sum of its proper divisors (1190799).

2556609 is a wasteful number, since it uses less digits than its factorization.

2556609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7068 (or 7057 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 2556609 is about 1598.9399613494. The cubic root of 2556609 is about 136.7376477072.

The spelling of 2556609 in words is "two million, five hundred fifty-six thousand, six hundred nine".