12181785331 has 2 divisors, whose sum is σ = 12181785332. Its totient is φ = 12181785330.

The previous prime is 12181785323. The next prime is 12181785337. The reversal of 12181785331 is 13358718121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12181785331 - 2³ = 12181785323 is a prime.

It is a super-2 number, since 2×12181785331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12181785337) 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, 6090892665 + 6090892666.

It is an arithmetic number, because the mean of its divisors is an integer number (6090892666).

Almost surely, 2^12181785331 is an apocalyptic number.

12181785331 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181785331 is an equidigital number, since it uses as much as digits as its factorization.

12181785331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The spelling of 12181785331 in words is "twelve billion, one hundred eighty-one million, seven hundred eighty-five thousand, three hundred thirty-one".