181266121 has 8 divisors (see below), whose sum is σ = 192105000. Its totient is φ = 170446848.

The previous prime is 181266119. The next prime is 181266139. The reversal of 181266121 is 121662181.

It can be written as a sum of positive squares in 4 ways, for example, as 77633721 + 103632400 = 8811^2 + 10180^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181266121 - 2¹ = 181266119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181266121.

It is not an unprimeable number, because it can be changed into a prime (181266161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16965 + ... + 25501.

It is an arithmetic number, because the mean of its divisors is an integer number (24013125).

Almost surely, 2^181266121 is an apocalyptic number.

It is an amenable number.

181266121 is a deficient number, since it is larger than the sum of its proper divisors (10838879).

181266121 is a wasteful number, since it uses less digits than its factorization.

181266121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9803.

The product of its digits is 1152, while the sum is 28.

The square root of 181266121 is about 13463.5107234332. The cubic root of 181266121 is about 565.9423759421.

The spelling of 181266121 in words is "one hundred eighty-one million, two hundred sixty-six thousand, one hundred twenty-one".