2561221174 has 16 divisors (see below), whose sum is σ = 3925076400. Its totient is φ = 1253159424.

The previous prime is 2561221163. The next prime is 2561221183. The reversal of 2561221174 is 4711221652.

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 7 ways as a sum of consecutive naturals, for example, 56904 + ... + 91435.

It is an arithmetic number, because the mean of its divisors is an integer number (245317275).

Almost surely, 2^2561221174 is an apocalyptic number.

2561221174 is a deficient number, since it is larger than the sum of its proper divisors (1363855226).

2561221174 is a wasteful number, since it uses less digits than its factorization.

2561221174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148527.

The product of its digits is 6720, while the sum is 31.

The square root of 2561221174 is about 50608.5089090758. The cubic root of 2561221174 is about 1368.1982413226.

The spelling of 2561221174 in words is "two billion, five hundred sixty-one million, two hundred twenty-one thousand, one hundred seventy-four".