2561285 has 8 divisors (see below), whose sum is σ = 3105816. Its totient is φ = 2027520.

The previous prime is 2561269. The next prime is 2561291. The reversal of 2561285 is 5821652.

It can be written as a sum of positive squares in 4 ways, for example, as 20449 + 2540836 = 143^2 + 1594^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561285 - 2⁴ = 2561269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156 + ... + 3125.

It is an arithmetic number, because the mean of its divisors is an integer number (388227).

2^2561285 is an apocalyptic number.

It is an amenable number.

2561285 is a deficient number, since it is larger than the sum of its proper divisors (544531).

2561285 is an equidigital number, since it uses as much as digits as its factorization.

2561285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383.

The product of its digits is 4800, while the sum is 29.

The square root of 2561285 is about 1600.4015121213. The cubic root of 2561285 is about 136.8209606460.

It can be divided in two parts, 25 and 61285, that multiplied together give a triangular number (1532125 = T₁₇₅₀).

The spelling of 2561285 in words is "two million, five hundred sixty-one thousand, two hundred eighty-five".