181222216 has 32 divisors (see below), whose sum is σ = 394706880. Its totient is φ = 76392000.

The previous prime is 181222207. The next prime is 181222219. The reversal of 181222216 is 612222181.

181222216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181222219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23110 + ... + 29941.

It is an arithmetic number, because the mean of its divisors is an integer number (12334590).

Almost surely, 2^181222216 is an apocalyptic number.

It is an amenable number.

181222216 is an abundant number, since it is smaller than the sum of its proper divisors (213484664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181222216 is a wasteful number, since it uses less digits than its factorization.

181222216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53125 (or 53121 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 181222216 is about 13461.8801064339. The cubic root of 181222216 is about 565.8966793970.

Adding to 181222216 its reverse (612222181), we get a palindrome (793444397).

The spelling of 181222216 in words is "one hundred eighty-one million, two hundred twenty-two thousand, two hundred sixteen".