2561723 has 2 divisors, whose sum is σ = 2561724. Its totient is φ = 2561722.

The previous prime is 2561683. The next prime is 2561729. The reversal of 2561723 is 3271652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561723 - 2⁶ = 2561659 is a prime.

It is a super-3 number, since 3×2561723³ = 50433343090061520201, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2561692 and 2561701.

It is not a weakly prime, because it can be changed into another prime (2561729) 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, 1280861 + 1280862.

It is an arithmetic number, because the mean of its divisors is an integer number (1280862).

2^2561723 is an apocalyptic number.

2561723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561723 is an equidigital number, since it uses as much as digits as its factorization.

2561723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 2561723 is about 1600.5383469321. The cubic root of 2561723 is about 136.8287593571.

The spelling of 2561723 in words is "two million, five hundred sixty-one thousand, seven hundred twenty-three".