181793145 has 16 divisors (see below), whose sum is σ = 300252672. Its totient is φ = 93828480.

The previous prime is 181793123. The next prime is 181793147. The reversal of 181793145 is 541397181.

It is not a de Polignac number, because 181793145 - 2¹⁴ = 181776761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181793147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195012 + ... + 195941.

It is an arithmetic number, because the mean of its divisors is an integer number (18765792).

Almost surely, 2^181793145 is an apocalyptic number.

181793145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181793145 is a deficient number, since it is larger than the sum of its proper divisors (118459527).

181793145 is a wasteful number, since it uses less digits than its factorization.

181793145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390992.

The product of its digits is 30240, while the sum is 39.

The square root of 181793145 is about 13483.0688272366. The cubic root of 181793145 is about 566.4903301772.

The spelling of 181793145 in words is "one hundred eighty-one million, seven hundred ninety-three thousand, one hundred forty-five".