12913181 has 2 divisors, whose sum is σ = 12913182. Its totient is φ = 12913180.

The previous prime is 12913177. The next prime is 12913211. The reversal of 12913181 is 18131921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6708100 + 6205081 = 2590^2 + 2491^2 .

It is an emirp because it is prime and its reverse (18131921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12913181 - 2² = 12913177 is a prime.

It is a super-2 number, since 2×12913181² = 333500487077522, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 12913181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12913171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6456590 + 6456591.

It is an arithmetic number, because the mean of its divisors is an integer number (6456591).

Almost surely, 2^12913181 is an apocalyptic number.

It is an amenable number.

12913181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12913181 is an equidigital number, since it uses as much as digits as its factorization.

12913181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 12913181 is about 3593.4914776579. The cubic root of 12913181 is about 234.6088619442.

The spelling of 12913181 in words is "twelve million, nine hundred thirteen thousand, one hundred eighty-one".