180494821 has 4 divisors (see below), whose sum is σ = 194379052. Its totient is φ = 166610592.

The previous prime is 180494819. The next prime is 180494827. The reversal of 180494821 is 128494081.

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 21986721 + 158508100 = 4689^2 + 12590^2 .

It is a cyclic number.

It is not a de Polignac number, because 180494821 - 2¹ = 180494819 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 (180494827) 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, 6942096 + ... + 6942121.

It is an arithmetic number, because the mean of its divisors is an integer number (48594763).

Almost surely, 2^180494821 is an apocalyptic number.

It is an amenable number.

180494821 is a deficient number, since it is larger than the sum of its proper divisors (13884231).

180494821 is a wasteful number, since it uses less digits than its factorization.

180494821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13884230.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 180494821 is about 13434.8360987397. The cubic root of 180494821 is about 565.1385266097.

The spelling of 180494821 in words is "one hundred eighty million, four hundred ninety-four thousand, eight hundred twenty-one".