181168641 has 12 divisors (see below), whose sum is σ = 265374720. Its totient is φ = 119077560.

The previous prime is 181168633. The next prime is 181168679. The reversal of 181168641 is 146861181.

181168641 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 6 + 8 + 641 = 666.

It is not a de Polignac number, because 181168641 - 2³ = 181168633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181168596 and 181168605.

It is not an unprimeable number, because it can be changed into a prime (181168601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141121 + ... + 142398.

It is an arithmetic number, because the mean of its divisors is an integer number (22114560).

Almost surely, 2^181168641 is an apocalyptic number.

It is an amenable number.

181168641 is a deficient number, since it is larger than the sum of its proper divisors (84206079).

181168641 is a wasteful number, since it uses less digits than its factorization.

181168641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283596 (or 283593 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 181168641 is about 13459.8900812748. The cubic root of 181168641 is about 565.8409082680.

The spelling of 181168641 in words is "one hundred eighty-one million, one hundred sixty-eight thousand, six hundred forty-one".