181047973 has 4 divisors (see below), whose sum is σ = 188919648. Its totient is φ = 173176300.

The previous prime is 181047953. The next prime is 181047989. The reversal of 181047973 is 379740181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181047973 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181047953) 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, 3935803 + ... + 3935848.

It is an arithmetic number, because the mean of its divisors is an integer number (47229912).

Almost surely, 2^181047973 is an apocalyptic number.

It is an amenable number.

181047973 is a deficient number, since it is larger than the sum of its proper divisors (7871675).

181047973 is an equidigital number, since it uses as much as digits as its factorization.

181047973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7871674.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 181047973 is about 13455.4068314563. The cubic root of 181047973 is about 565.7152536016.

The spelling of 181047973 in words is "one hundred eighty-one million, forty-seven thousand, nine hundred seventy-three".