181211045 has 4 divisors (see below), whose sum is σ = 217453260. Its totient is φ = 144968832.

The previous prime is 181211003. The next prime is 181211057. The reversal of 181211045 is 540112181.

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 55815841 + 125395204 = 7471^2 + 11198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181211045 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181211045.

It is a congruent number.

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, 18121100 + ... + 18121109.

It is an arithmetic number, because the mean of its divisors is an integer number (54363315).

Almost surely, 2^181211045 is an apocalyptic number.

It is an amenable number.

181211045 is a deficient number, since it is larger than the sum of its proper divisors (36242215).

181211045 is an equidigital number, since it uses as much as digits as its factorization.

181211045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36242214.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 181211045 is about 13461.4651877127. The cubic root of 181211045 is about 565.8850513861.

The spelling of 181211045 in words is "one hundred eighty-one million, two hundred eleven thousand, forty-five".