2561455 has 16 divisors (see below), whose sum is σ = 3344544. Its totient is φ = 1872000.

The previous prime is 2561431. The next prime is 2561491. The reversal of 2561455 is 5541652.

It is not a de Polignac number, because 2561455 - 2⁵ = 2561423 is a prime.

It is a super-2 number, since 2×2561455² = 13122103434050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10080 + ... + 10330.

It is an arithmetic number, because the mean of its divisors is an integer number (209034).

2^2561455 is an apocalyptic number.

2561455 is a deficient number, since it is larger than the sum of its proper divisors (783089).

2561455 is a wasteful number, since it uses less digits than its factorization.

2561455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its digits is 6000, while the sum is 28.

The square root of 2561455 is about 1600.4546229119. The cubic root of 2561455 is about 136.8239876486.

It can be divided in two parts, 256 and 1455, that added together give a triangular number (1711 = T₅₈).

The spelling of 2561455 in words is "two million, five hundred sixty-one thousand, four hundred fifty-five".