2628581 has 2 divisors, whose sum is σ = 2628582. Its totient is φ = 2628580.

The previous prime is 2628559. The next prime is 2628599. The reversal of 2628581 is 1858262.

2628581 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., 2592100 + 36481 = 1610^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628581 - 2¹⁰ = 2627557 is a prime.

It is a super-2 number, since 2×2628581² = 13818876147122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2628541) 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, 1314290 + 1314291.

It is an arithmetic number, because the mean of its divisors is an integer number (1314291).

2^2628581 is an apocalyptic number.

It is an amenable number.

2628581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2628581 is an equidigital number, since it uses as much as digits as its factorization.

2628581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 2628581 is about 1621.2899185525. The cubic root of 2628581 is about 138.0089086176.

The spelling of 2628581 in words is "two million, six hundred twenty-eight thousand, five hundred eighty-one".