181212113 has 2 divisors, whose sum is σ = 181212114. Its totient is φ = 181212112.

The previous prime is 181212107. The next prime is 181212127. The reversal of 181212113 is 311212181.

It is a happy number.

181212113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162996289 + 18215824 = 12767^2 + 4268^2 .

It is a cyclic number.

It is not a de Polignac number, because 181212113 - 2⁶ = 181212049 is a prime.

It is not a weakly prime, because it can be changed into another prime (181212133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90606056 + 90606057.

It is an arithmetic number, because the mean of its divisors is an integer number (90606057).

Almost surely, 2^181212113 is an apocalyptic number.

It is an amenable number.

181212113 is a deficient number, since it is larger than the sum of its proper divisors (1).

181212113 is an equidigital number, since it uses as much as digits as its factorization.

181212113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 20.

The square root of 181212113 is about 13461.5048564416. The cubic root of 181212113 is about 565.8861630991.

Adding to 181212113 its reverse (311212181), we get a palindrome (492424294).

The spelling of 181212113 in words is "one hundred eighty-one million, two hundred twelve thousand, one hundred thirteen".