12817213181 has 2 divisors, whose sum is σ = 12817213182. Its totient is φ = 12817213180.

The previous prime is 12817213177. The next prime is 12817213187. The reversal of 12817213181 is 18131271821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10397065156 + 2420148025 = 101966^2 + 49195^2 .

It is a cyclic number.

It is not a de Polignac number, because 12817213181 - 2² = 12817213177 is a prime.

It is a super-2 number, since 2×12817213181² (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 (12817213187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6408606590 + 6408606591.

It is an arithmetic number, because the mean of its divisors is an integer number (6408606591).

Almost surely, 2^12817213181 is an apocalyptic number.

It is an amenable number.

12817213181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12817213181 is an equidigital number, since it uses as much as digits as its factorization.

12817213181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 35.

The spelling of 12817213181 in words is "twelve billion, eight hundred seventeen million, two hundred thirteen thousand, one hundred eighty-one".