181606973 has 4 divisors (see below), whose sum is σ = 181752480. Its totient is φ = 181461468.

The previous prime is 181606951. The next prime is 181606979. The reversal of 181606973 is 379606181.

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 not a de Polignac number, because 181606973 - 2²⁴ = 164829757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181606973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181606979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70865 + ... + 73382.

It is an arithmetic number, because the mean of its divisors is an integer number (45438120).

Almost surely, 2^181606973 is an apocalyptic number.

It is an amenable number.

181606973 is a deficient number, since it is larger than the sum of its proper divisors (145507).

181606973 is a wasteful number, since it uses less digits than its factorization.

181606973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145506.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 181606973 is about 13476.1631408944. The cubic root of 181606973 is about 566.2968856629.

The spelling of 181606973 in words is "one hundred eighty-one million, six hundred six thousand, nine hundred seventy-three".