180721249 has 2 divisors, whose sum is σ = 180721250. Its totient is φ = 180721248.

The previous prime is 180721241. The next prime is 180721259. The reversal of 180721249 is 942127081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138886225 + 41835024 = 11785^2 + 6468^2 .

It is a cyclic number.

It is not a de Polignac number, because 180721249 - 2³ = 180721241 is a prime.

It is not a weakly prime, because it can be changed into another prime (180721241) 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 as a sum of consecutive naturals, namely, 90360624 + 90360625.

It is an arithmetic number, because the mean of its divisors is an integer number (90360625).

Almost surely, 2^180721249 is an apocalyptic number.

It is an amenable number.

180721249 is a deficient number, since it is larger than the sum of its proper divisors (1).

180721249 is an equidigital number, since it uses as much as digits as its factorization.

180721249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 180721249 is about 13443.2603560297. The cubic root of 180721249 is about 565.3747470796.

It can be divided in two parts, 18072 and 1249, that added together give a square (19321 = 139²).

The spelling of 180721249 in words is "one hundred eighty million, seven hundred twenty-one thousand, two hundred forty-nine".