2561726 has 4 divisors (see below), whose sum is σ = 3842592. Its totient is φ = 1280862.

The previous prime is 2561723. The next prime is 2561729. The reversal of 2561726 is 6271652.

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 (2561723) and next prime (2561729).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640430 + ... + 640433.

It is an arithmetic number, because the mean of its divisors is an integer number (960648).

2^2561726 is an apocalyptic number.

2561726 is a deficient number, since it is larger than the sum of its proper divisors (1280866).

2561726 is a wasteful number, since it uses less digits than its factorization.

2561726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280865.

The product of its digits is 5040, while the sum is 29.

The square root of 2561726 is about 1600.5392841165. The cubic root of 2561726 is about 136.8288127699.

The spelling of 2561726 in words is "two million, five hundred sixty-one thousand, seven hundred twenty-six".