2561065 has 24 divisors (see below), whose sum is σ = 3503304. Its totient is φ = 1785600.

The previous prime is 2561063. The next prime is 2561071. The reversal of 2561065 is 5601652.

It can be written as a sum of positive squares in 4 ways, for example, as 61504 + 2499561 = 248^2 + 1581^2 .

It is not a de Polignac number, because 2561065 - 2¹ = 2561063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62445 + ... + 62485.

It is an arithmetic number, because the mean of its divisors is an integer number (145971).

2^2561065 is an apocalyptic number.

It is an amenable number.

2561065 is a deficient number, since it is larger than the sum of its proper divisors (942239).

2561065 is a wasteful number, since it uses less digits than its factorization.

2561065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2561065 is about 1600.3327778934. The cubic root of 2561065 is about 136.8170431498.

The spelling of 2561065 in words is "two million, five hundred sixty-one thousand, sixty-five".