180875221 has 4 divisors (see below), whose sum is σ = 182740012. Its totient is φ = 179010432.

The previous prime is 180875207. The next prime is 180875249. The reversal of 180875221 is 122578081.

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 24900100 + 155975121 = 4990^2 + 12489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180875221 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 (180875021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932250 + ... + 932443.

It is an arithmetic number, because the mean of its divisors is an integer number (45685003).

Almost surely, 2^180875221 is an apocalyptic number.

It is an amenable number.

180875221 is a deficient number, since it is larger than the sum of its proper divisors (1864791).

180875221 is an equidigital number, since it uses as much as digits as its factorization.

180875221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864790.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 180875221 is about 13448.9858725482. The cubic root of 180875221 is about 565.5352653186.

The spelling of 180875221 in words is "one hundred eighty million, eight hundred seventy-five thousand, two hundred twenty-one".