180421243 has 4 divisors (see below), whose sum is σ = 180512280. Its totient is φ = 180330208.

The previous prime is 180421217. The next prime is 180421291. The reversal of 180421243 is 342124081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 180421243 - 2⁵ = 180421211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180422243) 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, 42478 + ... + 46531.

It is an arithmetic number, because the mean of its divisors is an integer number (45128070).

Almost surely, 2^180421243 is an apocalyptic number.

180421243 is a deficient number, since it is larger than the sum of its proper divisors (91037).

180421243 is an equidigital number, since it uses as much as digits as its factorization.

180421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91036.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 180421243 is about 13432.0974907123. The cubic root of 180421243 is about 565.0617240108.

The spelling of 180421243 in words is "one hundred eighty million, four hundred twenty-one thousand, two hundred forty-three".