181329745 has 4 divisors (see below), whose sum is σ = 217595700. Its totient is φ = 145063792.

The previous prime is 181329739. The next prime is 181329767. The reversal of 181329745 is 547923181.

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 114939841 + 66389904 = 10721^2 + 8148^2 .

It is a cyclic number.

It is not a de Polignac number, because 181329745 - 2⁹ = 181329233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181329698 and 181329707.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18132970 + ... + 18132979.

It is an arithmetic number, because the mean of its divisors is an integer number (54398925).

Almost surely, 2^181329745 is an apocalyptic number.

It is an amenable number.

181329745 is a deficient number, since it is larger than the sum of its proper divisors (36265955).

181329745 is an equidigital number, since it uses as much as digits as its factorization.

181329745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36265954.

The product of its digits is 60480, while the sum is 40.

The square root of 181329745 is about 13465.8733470949. The cubic root of 181329745 is about 566.0085830294.

The spelling of 181329745 in words is "one hundred eighty-one million, three hundred twenty-nine thousand, seven hundred forty-five".