2558581 has 2 divisors, whose sum is σ = 2558582. Its totient is φ = 2558580.

The previous prime is 2558533. The next prime is 2558599. The reversal of 2558581 is 1858552.

It is a happy number.

2558581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1359556 + 1199025 = 1166^2 + 1095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2558581 is a prime.

It is a super-2 number, since 2×2558581² = 13092673467122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2558531) 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, 1279290 + 1279291.

It is an arithmetic number, because the mean of its divisors is an integer number (1279291).

2^2558581 is an apocalyptic number.

It is an amenable number.

2558581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2558581 is an equidigital number, since it uses as much as digits as its factorization.

2558581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16000, while the sum is 34.

The square root of 2558581 is about 1599.5565010340. The cubic root of 2558581 is about 136.7727954807.

It can be divided in two parts, 255 and 8581, that added together give a square (8836 = 94²).

The spelling of 2558581 in words is "two million, five hundred fifty-eight thousand, five hundred eighty-one".