2561718 has 16 divisors (see below), whose sum is σ = 5171760. Its totient is φ = 845856.

The previous prime is 2561683. The next prime is 2561723. The reversal of 2561718 is 8171652.

It is a super-2 number, since 2×2561718² = 13124798223048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305 + ... + 2612.

It is an arithmetic number, because the mean of its divisors is an integer number (323235).

2^2561718 is an apocalyptic number.

2561718 is an abundant number, since it is smaller than the sum of its proper divisors (2610042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561718 is a wasteful number, since it uses less digits than its factorization.

2561718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031.

The product of its digits is 3360, while the sum is 30.

The square root of 2561718 is about 1600.5367849568. The cubic root of 2561718 is about 136.8286703358.

The spelling of 2561718 in words is "two million, five hundred sixty-one thousand, seven hundred eighteen".