12187213 has 2 divisors, whose sum is σ = 12187214. Its totient is φ = 12187212.

The previous prime is 12187211. The next prime is 12187223. The reversal of 12187213 is 31278121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11269449 + 917764 = 3357^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187213 - 2¹ = 12187211 is a prime.

Together with 12187211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12187211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093606 + 6093607.

It is an arithmetic number, because the mean of its divisors is an integer number (6093607).

Almost surely, 2^12187213 is an apocalyptic number.

It is an amenable number.

12187213 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187213 is an equidigital number, since it uses as much as digits as its factorization.

12187213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 12187213 is about 3491.0189057065. The cubic root of 12187213 is about 230.1272956336.

The spelling of 12187213 in words is "twelve million, one hundred eighty-seven thousand, two hundred thirteen".