2561694 has 32 divisors (see below), whose sum is σ = 5633280. Its totient is φ = 772992.

The previous prime is 2561683. The next prime is 2561723. The reversal of 2561694 is 4961652.

2561694 = 27² + 28² + ... + 197².

It is a super-2 number, since 2×2561694² = 13124552299272, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2134 + ... + 3110.

It is an arithmetic number, because the mean of its divisors is an integer number (176040).

2^2561694 is an apocalyptic number.

2561694 is an abundant number, since it is smaller than the sum of its proper divisors (3071586).

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

2561694 is a wasteful number, since it uses less digits than its factorization.

2561694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 12960, while the sum is 33.

The square root of 2561694 is about 1600.5292874546. The cubic root of 2561694 is about 136.8282430316.

The spelling of 2561694 in words is "two million, five hundred sixty-one thousand, six hundred ninety-four".