181605945 has 16 divisors (see below), whose sum is σ = 290855232. Its totient is φ = 96761280.

The previous prime is 181605943. The next prime is 181606003. The reversal of 181605945 is 549506181.

181605945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181605945 - 2¹ = 181605943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181605943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11455 + ... + 22235.

It is an arithmetic number, because the mean of its divisors is an integer number (18178452).

Almost surely, 2^181605945 is an apocalyptic number.

181605945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181605945 is a deficient number, since it is larger than the sum of its proper divisors (109249287).

181605945 is a wasteful number, since it uses less digits than its factorization.

181605945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11912.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 181605945 is about 13476.1249994203. The cubic root of 181605945 is about 566.2958171387.

The spelling of 181605945 in words is "one hundred eighty-one million, six hundred five thousand, nine hundred forty-five".