2561956 has 12 divisors (see below), whose sum is σ = 4501980. Its totient is φ = 1275680.

The previous prime is 2561953. The next prime is 2561959. The reversal of 2561956 is 6591652.

It is a happy number.

2561956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2561953) and next prime (2561959).

It can be written as a sum of positive squares in 2 ways, for example, as 52900 + 2509056 = 230^2 + 1584^2 .

It is not an unprimeable number, because it can be changed into a prime (2561953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115 + ... + 2266.

It is an arithmetic number, because the mean of its divisors is an integer number (375165).

2^2561956 is an apocalyptic number.

It is an amenable number.

2561956 is a deficient number, since it is larger than the sum of its proper divisors (1940024).

2561956 is a wasteful number, since it uses less digits than its factorization.

2561956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654 (or 2652 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The square root of 2561956 is about 1600.6111332863. The cubic root of 2561956 is about 136.8329076243.

The spelling of 2561956 in words is "two million, five hundred sixty-one thousand, nine hundred fifty-six".