2043581 has 4 divisors (see below), whose sum is σ = 2050464. Its totient is φ = 2036700.

The previous prime is 2043571. The next prime is 2043589. The reversal of 2043581 is 1853402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1853402 = 2 ⋅926701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2043581 is a prime.

It is a super-2 number, since 2×2043581² = 8352446607122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2975 + ... + 3596.

It is an arithmetic number, because the mean of its divisors is an integer number (512616).

2^2043581 is an apocalyptic number.

It is an amenable number.

2043581 is a deficient number, since it is larger than the sum of its proper divisors (6883).

2043581 is an equidigital number, since it uses as much as digits as its factorization.

2043581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2043581 is about 1429.5387367959. The cubic root of 2043581 is about 126.9006808168.

Adding to 2043581 its reverse (1853402), we get a palindrome (3896983).

The spelling of 2043581 in words is "two million, forty-three thousand, five hundred eighty-one".