181807133 has 2 divisors, whose sum is σ = 181807134. Its totient is φ = 181807132.

The previous prime is 181807121. The next prime is 181807141. The reversal of 181807133 is 331708181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110607289 + 71199844 = 10517^2 + 8438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181807133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181807133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181807183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90903566 + 90903567.

It is an arithmetic number, because the mean of its divisors is an integer number (90903567).

Almost surely, 2^181807133 is an apocalyptic number.

It is an amenable number.

181807133 is a deficient number, since it is larger than the sum of its proper divisors (1).

181807133 is an equidigital number, since it uses as much as digits as its factorization.

181807133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 181807133 is about 13483.5875418970. The cubic root of 181807133 is about 566.5048592609.

The spelling of 181807133 in words is "one hundred eighty-one million, eight hundred seven thousand, one hundred thirty-three".