18332912231 has 2 divisors, whose sum is σ = 18332912232. Its totient is φ = 18332912230.

The previous prime is 18332912209. The next prime is 18332912233. The reversal of 18332912231 is 13221923381.

It is a strong prime.

It is an emirp because it is prime and its reverse (13221923381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18332912231 is a prime.

It is a super-2 number, since 2×18332912231² (a number of 21 digits) contains 22 as substring.

Together with 18332912233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18332912191 and 18332912200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18332912233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166456115 + 9166456116.

It is an arithmetic number, because the mean of its divisors is an integer number (9166456116).

Almost surely, 2^18332912231 is an apocalyptic number.

18332912231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18332912231 is an equidigital number, since it uses as much as digits as its factorization.

18332912231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The spelling of 18332912231 in words is "eighteen billion, three hundred thirty-two million, nine hundred twelve thousand, two hundred thirty-one".