181533113 has 2 divisors, whose sum is σ = 181533114. Its totient is φ = 181533112.

The previous prime is 181533067. The next prime is 181533139. The reversal of 181533113 is 311335181.

It is an a-pointer prime, because the next prime (181533139) can be obtained adding 181533113 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166848889 + 14684224 = 12917^2 + 3832^2 .

It is a cyclic number.

It is not a de Polignac number, because 181533113 - 2¹⁰ = 181532089 is a prime.

It is a super-2 number, since 2×181533113² = 65908542230941538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181533193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90766556 + 90766557.

It is an arithmetic number, because the mean of its divisors is an integer number (90766557).

Almost surely, 2^181533113 is an apocalyptic number.

It is an amenable number.

181533113 is a deficient number, since it is larger than the sum of its proper divisors (1).

181533113 is an equidigital number, since it uses as much as digits as its factorization.

181533113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 181533113 is about 13473.4224679552. The cubic root of 181533113 is about 566.2201038101.

Adding to 181533113 its reverse (311335181), we get a palindrome (492868294).

The spelling of 181533113 in words is "one hundred eighty-one million, five hundred thirty-three thousand, one hundred thirteen".