2561807 has 2 divisors, whose sum is σ = 2561808. Its totient is φ = 2561806.

The previous prime is 2561771. The next prime is 2561813. The reversal of 2561807 is 7081652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561807 - 2⁶ = 2561743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2561807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280903 + 1280904.

It is an arithmetic number, because the mean of its divisors is an integer number (1280904).

2^2561807 is an apocalyptic number.

2561807 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561807 is an equidigital number, since it uses as much as digits as its factorization.

2561807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2561807 is about 1600.5645878877. The cubic root of 2561807 is about 136.8302548987.

The spelling of 2561807 in words is "two million, five hundred sixty-one thousand, eight hundred seven".