2556949 has 4 divisors (see below), whose sum is σ = 2561580. Its totient is φ = 2552320.

The previous prime is 2556943. The next prime is 2556977. The reversal of 2556949 is 9496552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1822500 + 734449 = 1350^2 + 857^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556949 - 2⁷ = 2556821 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2556949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556943) 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, 1354 + ... + 2635.

It is an arithmetic number, because the mean of its divisors is an integer number (640395).

2^2556949 is an apocalyptic number.

It is an amenable number.

2556949 is a deficient number, since it is larger than the sum of its proper divisors (4631).

2556949 is an equidigital number, since it uses as much as digits as its factorization.

2556949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630.

The product of its digits is 97200, while the sum is 40.

The square root of 2556949 is about 1599.0462782546. The cubic root of 2556949 is about 136.7437089573.

The spelling of 2556949 in words is "two million, five hundred fifty-six thousand, nine hundred forty-nine".