2558861 has 2 divisors, whose sum is σ = 2558862. Its totient is φ = 2558860.

The previous prime is 2558849. The next prime is 2558879. The reversal of 2558861 is 1688552.

It is a happy number.

2558861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 1142761 = 1190^2 + 1069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2558861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2552861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279430 + 1279431.

It is an arithmetic number, because the mean of its divisors is an integer number (1279431).

2^2558861 is an apocalyptic number.

It is an amenable number.

2558861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2558861 is an equidigital number, since it uses as much as digits as its factorization.

2558861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 2558861 is about 1599.6440229001. The cubic root of 2558861 is about 136.7777845724. Note that the first 4 decimals are identical.

The spelling of 2558861 in words is "two million, five hundred fifty-eight thousand, eight hundred sixty-one".