181137133 has 2 divisors, whose sum is σ = 181137134. Its totient is φ = 181137132.

The previous prime is 181137119. The next prime is 181137211. The reversal of 181137133 is 331731181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179506404 + 1630729 = 13398^2 + 1277^2 .

It is a cyclic number.

It is not a de Polignac number, because 181137133 - 2⁵ = 181137101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181137233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90568566 + 90568567.

It is an arithmetic number, because the mean of its divisors is an integer number (90568567).

Almost surely, 2^181137133 is an apocalyptic number.

It is an amenable number.

181137133 is a deficient number, since it is larger than the sum of its proper divisors (1).

181137133 is an equidigital number, since it uses as much as digits as its factorization.

181137133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 181137133 is about 13458.7195899164. The cubic root of 181137133 is about 565.8081035676.

The spelling of 181137133 in words is "one hundred eighty-one million, one hundred thirty-seven thousand, one hundred thirty-three".