2561145 has 16 divisors (see below), whose sum is σ = 4136832. Its totient is φ = 1352960.

The previous prime is 2561137. The next prime is 2561159. The reversal of 2561145 is 5411652.

2561145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561145 - 2³ = 2561137 is a prime.

It is a super-2 number, since 2×2561145² = 13118927422050, which contains 22 as substring.

2561145 is a lucky number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 940 + ... + 2450.

It is an arithmetic number, because the mean of its divisors is an integer number (258552).

2^2561145 is an apocalyptic number.

It is an amenable number.

2561145 is a deficient number, since it is larger than the sum of its proper divisors (1575687).

2561145 is a wasteful number, since it uses less digits than its factorization.

2561145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its digits is 1200, while the sum is 24.

The square root of 2561145 is about 1600.3577724996. The cubic root of 2561145 is about 136.8184677198.

Adding to 2561145 its reverse (5411652), we get a palindrome (7972797).

The spelling of 2561145 in words is "two million, five hundred sixty-one thousand, one hundred forty-five".