180081689 has 2 divisors, whose sum is σ = 180081690. Its totient is φ = 180081688.

The previous prime is 180081661. The next prime is 180081709. The reversal of 180081689 is 986180081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121176064 + 58905625 = 11008^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 180081689 - 2¹⁶ = 180016153 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (180021689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90040844 + 90040845.

It is an arithmetic number, because the mean of its divisors is an integer number (90040845).

Almost surely, 2^180081689 is an apocalyptic number.

It is an amenable number.

180081689 is a deficient number, since it is larger than the sum of its proper divisors (1).

180081689 is an equidigital number, since it uses as much as digits as its factorization.

180081689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 180081689 is about 13419.4518889558. The cubic root of 180081689 is about 564.7070180688.

The spelling of 180081689 in words is "one hundred eighty million, eighty-one thousand, six hundred eighty-nine".