3243216181 has 4 divisors (see below), whose sum is σ = 3244450572. Its totient is φ = 3241981792.

The previous prime is 3243216161. The next prime is 3243216211. The reversal of 3243216181 is 1816123423.

3243216181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1196468100 + 2046748081 = 34590^2 + 45241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3243216181 is a prime.

It is a super-3 number, since 3×3243216181³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3243216161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613246 + ... + 618511.

It is an arithmetic number, because the mean of its divisors is an integer number (811112643).

Almost surely, 2^3243216181 is an apocalyptic number.

It is an amenable number.

3243216181 is a deficient number, since it is larger than the sum of its proper divisors (1234391).

3243216181 is a wasteful number, since it uses less digits than its factorization.

3243216181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234390.

The product of its digits is 6912, while the sum is 31.

The square root of 3243216181 is about 56949.2421459671. The cubic root of 3243216181 is about 1480.2166990039.

The spelling of 3243216181 in words is "three billion, two hundred forty-three million, two hundred sixteen thousand, one hundred eighty-one".