2560681 has 4 divisors (see below), whose sum is σ = 2564100. Its totient is φ = 2557264.

The previous prime is 2560669. The next prime is 2560697. The reversal of 2560681 is 1860652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 912025 + 1648656 = 955^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2560681 - 2⁹ = 2560169 is a prime.

It is a super-2 number, since 2×2560681² = 13114174367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2560601) 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, 46 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (641025).

2^2560681 is an apocalyptic number.

It is an amenable number.

2560681 is a deficient number, since it is larger than the sum of its proper divisors (3419).

2560681 is a wasteful number, since it uses less digits than its factorization.

2560681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2560681 is about 1600.2127983490. The cubic root of 2560681 is about 136.8102048006.

It can be divided in two parts, 25 and 60681, that added together give a palindrome (60706).

The spelling of 2560681 in words is "two million, five hundred sixty thousand, six hundred eighty-one".