2043853681 has 9 divisors (see below), whose sum is σ = 2085589569. Its totient is φ = 2002939536.

The previous prime is 2043853667. The next prime is 2043853697. The reversal of 2043853681 is 1863583402.

The square root of 2043853681 is 45209.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 194853681 + 1849000000 = 13959^2 + 43000^2 .

It is not a de Polignac number, because 2043853681 - 2¹¹ = 2043851633 is a prime.

It is a super-2 number, since 2×2043853681² = 8354675738674499522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2043853621) 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 8 ways as a sum of consecutive naturals, for example, 2395651 + ... + 2396503.

Almost surely, 2^2043853681 is an apocalyptic number.

2043853681 is the 45209-th square number.

2043853681 is the 22605-th centered octagonal number.

It is an amenable number.

2043853681 is a deficient number, since it is larger than the sum of its proper divisors (41735888).

2043853681 is an frugal number, since it uses more digits than its factorization.

2043853681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The cubic root of 2043853681 is about 1269.0632480896.

The spelling of 2043853681 in words is "two billion, forty-three million, eight hundred fifty-three thousand, six hundred eighty-one".