181320983 has 16 divisors (see below), whose sum is σ = 197164800. Its totient is φ = 166288320.

The previous prime is 181320959. The next prime is 181320989. The reversal of 181320983 is 389023181.

It is a cyclic number.

It is not a de Polignac number, because 181320983 - 2¹² = 181316887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181320989) 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, 54008 + ... + 57266.

It is an arithmetic number, because the mean of its divisors is an integer number (12322800).

Almost surely, 2^181320983 is an apocalyptic number.

181320983 is a deficient number, since it is larger than the sum of its proper divisors (15843817).

181320983 is a wasteful number, since it uses less digits than its factorization.

181320983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 181320983 is about 13465.5480022166. The cubic root of 181320983 is about 565.9994662183. Note that the first 3 decimals are identical.

The spelling of 181320983 in words is "one hundred eighty-one million, three hundred twenty thousand, nine hundred eighty-three".