12642191 has 2 divisors, whose sum is σ = 12642192. Its totient is φ = 12642190.

The previous prime is 12642181. The next prime is 12642199. The reversal of 12642191 is 19124621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12642191 - 2⁶ = 12642127 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12642191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321095 + 6321096.

It is an arithmetic number, because the mean of its divisors is an integer number (6321096).

Almost surely, 2^12642191 is an apocalyptic number.

12642191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642191 is an equidigital number, since it uses as much as digits as its factorization.

12642191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 12642191 is about 3555.5858870234. The cubic root of 12642191 is about 232.9561154434.

The spelling of 12642191 in words is "twelve million, six hundred forty-two thousand, one hundred ninety-one".