1803085681 has 4 divisors (see below), whose sum is σ = 1804786164. Its totient is φ = 1801385200.

The previous prime is 1803085639. The next prime is 1803085699. The reversal of 1803085681 is 1865803081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1081357456 + 721728225 = 32884^2 + 26865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1803085681 - 2⁷ = 1803085553 is a prime.

It is a super-2 number, since 2×1803085681² = 6502235946054467522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1803085381) 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 3 ways as a sum of consecutive naturals, for example, 848650 + ... + 850771.

It is an arithmetic number, because the mean of its divisors is an integer number (451196541).

Almost surely, 2^1803085681 is an apocalyptic number.

It is an amenable number.

1803085681 is a deficient number, since it is larger than the sum of its proper divisors (1700483).

1803085681 is a wasteful number, since it uses less digits than its factorization.

1803085681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700482.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1803085681 is about 42462.7563989904. The cubic root of 1803085681 is about 1217.1351035974.

The spelling of 1803085681 in words is "one billion, eight hundred three million, eighty-five thousand, six hundred eighty-one".