2042581 has 2 divisors, whose sum is σ = 2042582. Its totient is φ = 2042580.

The previous prime is 2042549. The next prime is 2042587. The reversal of 2042581 is 1852402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1418481 + 624100 = 1191^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042581 - 2⁵ = 2042549 is a prime.

It is a super-2 number, since 2×2042581² = 8344274283122, 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 (2042587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021290 + 1021291.

It is an arithmetic number, because the mean of its divisors is an integer number (1021291).

2^2042581 is an apocalyptic number.

It is an amenable number.

2042581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042581 is an equidigital number, since it uses as much as digits as its factorization.

2042581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2042581 is about 1429.1889308276. The cubic root of 2042581 is about 126.8799783692.

Adding to 2042581 its reverse (1852402), we get a palindrome (3894983).

The spelling of 2042581 in words is "two million, forty-two thousand, five hundred eighty-one".