2561318 has 4 divisors (see below), whose sum is σ = 3841980. Its totient is φ = 1280658.

The previous prime is 2561291. The next prime is 2561323. The reversal of 2561318 is 8131652.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640328 + ... + 640331.

It is an arithmetic number, because the mean of its divisors is an integer number (960495).

2^2561318 is an apocalyptic number.

2561318 is a deficient number, since it is larger than the sum of its proper divisors (1280662).

2561318 is a wasteful number, since it uses less digits than its factorization.

2561318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280661.

The product of its digits is 1440, while the sum is 26.

The square root of 2561318 is about 1600.4118220008. The cubic root of 2561318 is about 136.8215482511.

The spelling of 2561318 in words is "two million, five hundred sixty-one thousand, three hundred eighteen".