12931181 has 2 divisors, whose sum is σ = 12931182. Its totient is φ = 12931180.

The previous prime is 12931133. The next prime is 12931199. The reversal of 12931181 is 18113921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 1768900 = 3341^2 + 1330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12931181 is a prime.

It is a super-2 number, since 2×12931181² = 334430884109522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12931181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12931111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465590 + 6465591.

It is an arithmetic number, because the mean of its divisors is an integer number (6465591).

Almost surely, 2^12931181 is an apocalyptic number.

It is an amenable number.

12931181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931181 is an equidigital number, since it uses as much as digits as its factorization.

12931181 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12931181 is about 3595.9951334784. The cubic root of 12931181 is about 234.7178203506.

Subtracting from 12931181 its sum of digits (26), we obtain a triangular number (12931155 = T₅₀₈₅).

The spelling of 12931181 in words is "twelve million, nine hundred thirty-one thousand, one hundred eighty-one".