181222413 has 4 divisors (see below), whose sum is σ = 241629888. Its totient is φ = 120814940.

The previous prime is 181222357. The next prime is 181222417. The reversal of 181222413 is 314222181.

181222413 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181222413 - 2¹³ = 181214221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181222417) 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, 30203733 + ... + 30203738.

It is an arithmetic number, because the mean of its divisors is an integer number (60407472).

Almost surely, 2^181222413 is an apocalyptic number.

It is an amenable number.

181222413 is a deficient number, since it is larger than the sum of its proper divisors (60407475).

181222413 is an equidigital number, since it uses as much as digits as its factorization.

181222413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60407474.

The product of its digits is 768, while the sum is 24.

The square root of 181222413 is about 13461.8874233890. The cubic root of 181222413 is about 565.8968844521.

Adding to 181222413 its reverse (314222181), we get a palindrome (495444594).

The spelling of 181222413 in words is "one hundred eighty-one million, two hundred twenty-two thousand, four hundred thirteen".