2561290 has 8 divisors (see below), whose sum is σ = 4610340. Its totient is φ = 1024512.

The previous prime is 2561269. The next prime is 2561291. The reversal of 2561290 is 921652.

It can be written as a sum of positive squares in 2 ways, for example, as 2556801 + 4489 = 1599^2 + 67^2 .

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

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2561291) 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, 128055 + ... + 128074.

2^2561290 is an apocalyptic number.

2561290 is a deficient number, since it is larger than the sum of its proper divisors (2049050).

2561290 is a wasteful number, since it uses less digits than its factorization.

2561290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256136.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2561290 is about 1600.4030742285. The cubic root of 2561290 is about 136.8210496774.

The spelling of 2561290 in words is "two million, five hundred sixty-one thousand, two hundred ninety".