181188121 has 2 divisors, whose sum is σ = 181188122. Its totient is φ = 181188120.

The previous prime is 181188101. The next prime is 181188157. The reversal of 181188121 is 121881181.

181188121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116208400 + 64979721 = 10780^2 + 8061^2 .

It is a cyclic number.

It is not a de Polignac number, because 181188121 - 2¹⁵ = 181155353 is a prime.

It is not a weakly prime, because it can be changed into another prime (181188101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90594060 + 90594061.

It is an arithmetic number, because the mean of its divisors is an integer number (90594061).

Almost surely, 2^181188121 is an apocalyptic number.

It is an amenable number.

181188121 is a deficient number, since it is larger than the sum of its proper divisors (1).

181188121 is an equidigital number, since it uses as much as digits as its factorization.

181188121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 31.

The square root of 181188121 is about 13460.6136932905. The cubic root of 181188121 is about 565.8611880578.

The spelling of 181188121 in words is "one hundred eighty-one million, one hundred eighty-eight thousand, one hundred twenty-one".