12402191 has 2 divisors, whose sum is σ = 12402192. Its totient is φ = 12402190.

The previous prime is 12402179. The next prime is 12402217. The reversal of 12402191 is 19120421.

12402191 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19120421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12402191 - 2¹⁸ = 12140047 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12402151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201095 + 6201096.

It is an arithmetic number, because the mean of its divisors is an integer number (6201096).

Almost surely, 2^12402191 is an apocalyptic number.

12402191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12402191 is an equidigital number, since it uses as much as digits as its factorization.

12402191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 12402191 is about 3521.6744596853. The cubic root of 12402191 is about 231.4725370815.

The spelling of 12402191 in words is "twelve million, four hundred two thousand, one hundred ninety-one".