2561155 has 8 divisors (see below), whose sum is σ = 3088512. Its totient is φ = 2038848.

The previous prime is 2561137. The next prime is 2561159. The reversal of 2561155 is 5511652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561155 - 2²¹ = 464003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (386064).

2^2561155 is an apocalyptic number.

2561155 is a deficient number, since it is larger than the sum of its proper divisors (527357).

2561155 is a wasteful number, since it uses less digits than its factorization.

2561155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525.

The product of its digits is 1500, while the sum is 25.

The square root of 2561155 is about 1600.3608967980. The cubic root of 2561155 is about 136.8186457890.

The spelling of 2561155 in words is "two million, five hundred sixty-one thousand, one hundred fifty-five".