2042881 has 4 divisors (see below), whose sum is σ = 2098132. Its totient is φ = 1987632.

The previous prime is 2042863. The next prime is 2042891. The reversal of 2042881 is 1882402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1882402 = 2 ⋅941201.

It can be written as a sum of positive squares in 2 ways, for example, as 1575025 + 467856 = 1255^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042881 - 2⁵ = 2042849 is a prime.

It is a super-2 number, since 2×2042881² = 8346725560322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

2042881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2042851) 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, 27570 + ... + 27643.

It is an arithmetic number, because the mean of its divisors is an integer number (524533).

2^2042881 is an apocalyptic number.

It is an amenable number.

2042881 is a deficient number, since it is larger than the sum of its proper divisors (55251).

2042881 is an equidigital number, since it uses as much as digits as its factorization.

2042881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55250.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 2042881 is about 1429.2938816073. The cubic root of 2042881 is about 126.8861898128.

The spelling of 2042881 in words is "two million, forty-two thousand, eight hundred eighty-one".