181162045 has 4 divisors (see below), whose sum is σ = 217394460. Its totient is φ = 144929632.

The previous prime is 181162031. The next prime is 181162049. The reversal of 181162045 is 540261181.

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 99241444 + 81920601 = 9962^2 + 9051^2 .

It is a cyclic number.

It is not a de Polignac number, because 181162045 - 2⁷ = 181161917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181162049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18116200 + ... + 18116209.

It is an arithmetic number, because the mean of its divisors is an integer number (54348615).

Almost surely, 2^181162045 is an apocalyptic number.

It is an amenable number.

181162045 is a deficient number, since it is larger than the sum of its proper divisors (36232415).

181162045 is an equidigital number, since it uses as much as digits as its factorization.

181162045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36232414.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 181162045 is about 13459.6450547553. The cubic root of 181162045 is about 565.8340411268.

The spelling of 181162045 in words is "one hundred eighty-one million, one hundred sixty-two thousand, forty-five".