18235212319 has 2 divisors, whose sum is σ = 18235212320. Its totient is φ = 18235212318.

The previous prime is 18235212313. The next prime is 18235212353. The reversal of 18235212319 is 91321253281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18235212319 - 2³ = 18235212311 is a prime.

It is a super-2 number, since 2×18235212319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18235212311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9117606159 + 9117606160.

It is an arithmetic number, because the mean of its divisors is an integer number (9117606160).

Almost surely, 2^18235212319 is an apocalyptic number.

18235212319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18235212319 is an equidigital number, since it uses as much as digits as its factorization.

18235212319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The spelling of 18235212319 in words is "eighteen billion, two hundred thirty-five million, two hundred twelve thousand, three hundred nineteen".