18309072589 has 2 divisors, whose sum is σ = 18309072590. Its totient is φ = 18309072588.

The previous prime is 18309072577. The next prime is 18309072631. The reversal of 18309072589 is 98527090381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12274424100 + 6034648489 = 110790^2 + 77683^2 .

It is an emirp because it is prime and its reverse (98527090381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18309072589 - 2⁷ = 18309072461 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18309072289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154536294 + 9154536295.

It is an arithmetic number, because the mean of its divisors is an integer number (9154536295).

Almost surely, 2^18309072589 is an apocalyptic number.

It is an amenable number.

18309072589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309072589 is an equidigital number, since it uses as much as digits as its factorization.

18309072589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 18309072589 in words is "eighteen billion, three hundred nine million, seventy-two thousand, five hundred eighty-nine".