2041981 has 4 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 2031100.

The previous prime is 2041967. The next prime is 2041997. The reversal of 2041981 is 1891402.

It is a happy number.

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: 1891402 = 2 ⋅945701.

It is a cyclic number.

It is not a de Polignac number, because 2041981 - 2⁹ = 2041469 is a prime.

It is a super-2 number, since 2×2041981² = 8339372808722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2041961) 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 3 ways as a sum of consecutive naturals, for example, 5155 + ... + 5536.

It is an arithmetic number, because the mean of its divisors is an integer number (513216).

2^2041981 is an apocalyptic number.

It is an amenable number.

2041981 is a deficient number, since it is larger than the sum of its proper divisors (10883).

2041981 is a wasteful number, since it uses less digits than its factorization.

2041981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10882.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2041981 is about 1428.9790061439. The cubic root of 2041981 is about 126.8675536572.

The spelling of 2041981 in words is "two million, forty-one thousand, nine hundred eighty-one".