2043561 has 16 divisors (see below), whose sum is σ = 2985920. Its totient is φ = 1235520.

The previous prime is 2043541. The next prime is 2043571. The reversal of 2043561 is 1653402.

It is a happy number.

It is not a de Polignac number, because 2043561 - 2⁶ = 2043497 is a prime.

It is a super-2 number, since 2×2043561² = 8352283121442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2043511) 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 in 15 ways as a sum of consecutive naturals, for example, 1950 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (186620).

2^2043561 is an apocalyptic number.

It is an amenable number.

2043561 is a deficient number, since it is larger than the sum of its proper divisors (942359).

2043561 is a wasteful number, since it uses less digits than its factorization.

2043561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2043561 is about 1429.5317415154. The cubic root of 2043561 is about 126.9002668340.

Adding to 2043561 its reverse (1653402), we get a palindrome (3696963).

The spelling of 2043561 in words is "two million, forty-three thousand, five hundred sixty-one".