2028581 has 2 divisors, whose sum is σ = 2028582. Its totient is φ = 2028580.

The previous prime is 2028527. The next prime is 2028589. The reversal of 2028581 is 1858202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 312481 = 1310^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2028581 - 2⁶ = 2028517 is a prime.

It is a super-2 number, since 2×2028581² = 8230281747122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2028581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2028589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014290 + 1014291.

It is an arithmetic number, because the mean of its divisors is an integer number (1014291).

2^2028581 is an apocalyptic number.

It is an amenable number.

2028581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2028581 is an equidigital number, since it uses as much as digits as its factorization.

2028581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 2028581 is about 1424.2826264474. The cubic root of 2028581 is about 126.5894319864.

The spelling of 2028581 in words is "two million, twenty-eight thousand, five hundred eighty-one".