2561695 has 16 divisors (see below), whose sum is σ = 3223008. Its totient is φ = 1952640.

The previous prime is 2561683. The next prime is 2561723. The reversal of 2561695 is 5961652.

It is a happy number.

It is not a de Polignac number, because 2561695 - 2¹³ = 2553503 is a prime.

It is a Duffinian number.

2561695 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561695.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 11172 + ... + 11398.

It is an arithmetic number, because the mean of its divisors is an integer number (201438).

2^2561695 is an apocalyptic number.

2561695 is a deficient number, since it is larger than the sum of its proper divisors (661313).

2561695 is a wasteful number, since it uses less digits than its factorization.

2561695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

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

The square root of 2561695 is about 1600.5295998512. The cubic root of 2561695 is about 136.8282608360.

The spelling of 2561695 in words is "two million, five hundred sixty-one thousand, six hundred ninety-five".