180851845 has 4 divisors (see below), whose sum is σ = 217022220. Its totient is φ = 144681472.

The previous prime is 180851843. The next prime is 180851849. The reversal of 180851845 is 548158081.

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 107868996 + 72982849 = 10386^2 + 8543^2 .

It is a cyclic number.

It is not a de Polignac number, because 180851845 - 2¹ = 180851843 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 junction number, because it is equal to n+sod(n) for n = 180851798 and 180851807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180851843) 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, 18085180 + ... + 18085189.

It is an arithmetic number, because the mean of its divisors is an integer number (54255555).

Almost surely, 2^180851845 is an apocalyptic number.

It is an amenable number.

180851845 is a deficient number, since it is larger than the sum of its proper divisors (36170375).

180851845 is an equidigital number, since it uses as much as digits as its factorization.

180851845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36170374.

The product of its (nonzero) digits is 51200, while the sum is 40.

The square root of 180851845 is about 13448.1167826577. The cubic root of 180851845 is about 565.5109013365.

The spelling of 180851845 in words is "one hundred eighty million, eight hundred fifty-one thousand, eight hundred forty-five".