181050109 has 2 divisors, whose sum is σ = 181050110. Its totient is φ = 181050108.

The previous prime is 181050091. The next prime is 181050143. The reversal of 181050109 is 901050181.

Together with previous prime (181050091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175032900 + 6017209 = 13230^2 + 2453^2 .

It is an emirp because it is prime and its reverse (901050181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181050109 - 2⁹ = 181049597 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181050179) 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, 90525054 + 90525055.

It is an arithmetic number, because the mean of its divisors is an integer number (90525055).

Almost surely, 2^181050109 is an apocalyptic number.

It is an amenable number.

181050109 is a deficient number, since it is larger than the sum of its proper divisors (1).

181050109 is an equidigital number, since it uses as much as digits as its factorization.

181050109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 181050109 is about 13455.4862045190. The cubic root of 181050109 is about 565.7174783582.

The spelling of 181050109 in words is "one hundred eighty-one million, fifty thousand, one hundred nine".