18228281309 has 12 divisors (see below), whose sum is σ = 21211199100. Its totient is φ = 15619177728.

The previous prime is 18228281303. The next prime is 18228281327. The reversal of 18228281309 is 90318282281.

It can be written as a sum of positive squares in 2 ways, for example, as 12348765625 + 5879515684 = 111125^2 + 76678^2 .

It is not a de Polignac number, because 18228281309 - 2¹⁶ = 18228215773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18228281309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228281303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96587 + ... + 213975.

It is an arithmetic number, because the mean of its divisors is an integer number (1767599925).

Almost surely, 2^18228281309 is an apocalyptic number.

It is an amenable number.

18228281309 is a deficient number, since it is larger than the sum of its proper divisors (2982917791).

18228281309 is a wasteful number, since it uses less digits than its factorization.

18228281309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120572 (or 120565 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 18228281309 in words is "eighteen billion, two hundred twenty-eight million, two hundred eighty-one thousand, three hundred nine".