2561863 has 2 divisors, whose sum is σ = 2561864. Its totient is φ = 2561862.

The previous prime is 2561857. The next prime is 2561873. The reversal of 2561863 is 3681652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2561863 - 2¹³ = 2553671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280931 + 1280932.

It is an arithmetic number, because the mean of its divisors is an integer number (1280932).

2^2561863 is an apocalyptic number.

2561863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561863 is an equidigital number, since it uses as much as digits as its factorization.

2561863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 2561863 is about 1600.5820816191. The cubic root of 2561863 is about 136.8312519083.

The spelling of 2561863 in words is "two million, five hundred sixty-one thousand, eight hundred sixty-three".