181914919229 has 2 divisors, whose sum is σ = 181914919230. Its totient is φ = 181914919228.

The previous prime is 181914919181. The next prime is 181914919261. The reversal of 181914919229 is 922919419181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151809199129 + 30105720100 = 389627^2 + 173510^2 .

It is an emirp because it is prime and its reverse (922919419181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181914919229 - 2²⁸ = 181646483773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181914999229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90957459614 + 90957459615.

It is an arithmetic number, because the mean of its divisors is an integer number (90957459615).

Almost surely, 2^181914919229 is an apocalyptic number.

It is an amenable number.

181914919229 is a deficient number, since it is larger than the sum of its proper divisors (1).

181914919229 is an equidigital number, since it uses as much as digits as its factorization.

181914919229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 56.

The spelling of 181914919229 in words is "one hundred eighty-one billion, nine hundred fourteen million, nine hundred nineteen thousand, two hundred twenty-nine".