181983681 has 24 divisors (see below), whose sum is σ = 287239680. Its totient is φ = 110109600.

The previous prime is 181983673. The next prime is 181983701. The reversal of 181983681 is 186389181.

181983681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181983681 - 2³ = 181983673 is a prime.

It is a super-2 number, since 2×181983681² = 66236120300619522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181983661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80160 + ... + 82398.

It is an arithmetic number, because the mean of its divisors is an integer number (11968320).

Almost surely, 2^181983681 is an apocalyptic number.

181983681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181983681 is a deficient number, since it is larger than the sum of its proper divisors (105255999).

181983681 is a wasteful number, since it uses less digits than its factorization.

181983681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077 (or 3074 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 181983681 is about 13490.1327272937. The cubic root of 181983681 is about 566.6881724633.

The spelling of 181983681 in words is "one hundred eighty-one million, nine hundred eighty-three thousand, six hundred eighty-one".