181180145 has 4 divisors (see below), whose sum is σ = 217416180. Its totient is φ = 144944112.

The previous prime is 181180123. The next prime is 181180183. The reversal of 181180145 is 541081181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44102881 + 137077264 = 6641^2 + 11708^2 .

It is a cyclic number.

It is not a de Polignac number, because 181180145 - 2¹² = 181176049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18118010 + ... + 18118019.

It is an arithmetic number, because the mean of its divisors is an integer number (54354045).

Almost surely, 2^181180145 is an apocalyptic number.

It is an amenable number.

181180145 is a deficient number, since it is larger than the sum of its proper divisors (36236035).

181180145 is an equidigital number, since it uses as much as digits as its factorization.

181180145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36236034.

The product of its (nonzero) digits is 1280, while the sum is 29.

The square root of 181180145 is about 13460.3174182484. The cubic root of 181180145 is about 565.8528847632.

The spelling of 181180145 in words is "one hundred eighty-one million, one hundred eighty thousand, one hundred forty-five".