2044571981 has 8 divisors (see below), whose sum is σ = 2055751224. Its totient is φ = 2033418240.

The previous prime is 2044571909. The next prime is 2044571983. The reversal of 2044571981 is 1891754402.

It can be written as a sum of positive squares in 4 ways, for example, as 358155625 + 1686416356 = 18925^2 + 41066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2044571981 is a prime.

It is a super-2 number, since 2×2044571981² = 8360549170980528722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2044571983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167051 + ... + 178871.

It is an arithmetic number, because the mean of its divisors is an integer number (256968903).

Almost surely, 2^2044571981 is an apocalyptic number.

It is an amenable number.

2044571981 is a deficient number, since it is larger than the sum of its proper divisors (11179243).

2044571981 is a wasteful number, since it uses less digits than its factorization.

2044571981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12751.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 2044571981 is about 45216.9435167836. The cubic root of 2044571981 is about 1269.2118988748.

The spelling of 2044571981 in words is "two billion, forty-four million, five hundred seventy-one thousand, nine hundred eighty-one".