2561255 has 4 divisors (see below), whose sum is σ = 3073512. Its totient is φ = 2049000.

The previous prime is 2561239. The next prime is 2561261. The reversal of 2561255 is 5521652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2561255 - 2⁴ = 2561239 is a prime.

It is an Ulam number.

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 3 ways as a sum of consecutive naturals, for example, 256121 + ... + 256130.

It is an arithmetic number, because the mean of its divisors is an integer number (768378).

2^2561255 is an apocalyptic number.

2561255 is a deficient number, since it is larger than the sum of its proper divisors (512257).

2561255 is an equidigital number, since it uses as much as digits as its factorization.

2561255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512256.

The product of its digits is 3000, while the sum is 26.

The square root of 2561255 is about 1600.3921394458. The cubic root of 2561255 is about 136.8204264552.

The spelling of 2561255 in words is "two million, five hundred sixty-one thousand, two hundred fifty-five".