18328728241 has 2 divisors, whose sum is σ = 18328728242. Its totient is φ = 18328728240.

The previous prime is 18328728239. The next prime is 18328728259. The reversal of 18328728241 is 14282782381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16609796641 + 1718931600 = 128879^2 + 41460^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328728241 - 2¹ = 18328728239 is a prime.

Together with 18328728239, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18328728191 and 18328728200.

It is not a weakly prime, because it can be changed into another prime (18328728281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164364120 + 9164364121.

It is an arithmetic number, because the mean of its divisors is an integer number (9164364121).

Almost surely, 2^18328728241 is an apocalyptic number.

It is an amenable number.

18328728241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328728241 is an equidigital number, since it uses as much as digits as its factorization.

18328728241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344064, while the sum is 46.

The spelling of 18328728241 in words is "eighteen billion, three hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred forty-one".