2560921 has 4 divisors (see below), whose sum is σ = 2793744. Its totient is φ = 2328100.

The previous prime is 2560891. The next prime is 2560927. The reversal of 2560921 is 1290652.

2560921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2560921 - 2⁷ = 2560793 is a prime.

It is a Duffinian number.

2560921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2560927) 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, 116395 + ... + 116416.

It is an arithmetic number, because the mean of its divisors is an integer number (698436).

2^2560921 is an apocalyptic number.

It is an amenable number.

2560921 is a deficient number, since it is larger than the sum of its proper divisors (232823).

2560921 is a wasteful number, since it uses less digits than its factorization.

2560921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232822.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2560921 is about 1600.2877866184. The cubic root of 2560921 is about 136.8144788489.

It can be divided in two parts, 2560 and 921, that added together give a square (3481 = 59²).

The spelling of 2560921 in words is "two million, five hundred sixty thousand, nine hundred twenty-one".