12215191 has 2 divisors, whose sum is σ = 12215192. Its totient is φ = 12215190.

The previous prime is 12215179. The next prime is 12215201. The reversal of 12215191 is 19151221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12215191 - 2¹⁷ = 12084119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12215101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6107595 + 6107596.

It is an arithmetic number, because the mean of its divisors is an integer number (6107596).

Almost surely, 2^12215191 is an apocalyptic number.

12215191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12215191 is an equidigital number, since it uses as much as digits as its factorization.

12215191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 22.

The square root of 12215191 is about 3495.0237481310. The cubic root of 12215191 is about 230.3032609624.

The spelling of 12215191 in words is "twelve million, two hundred fifteen thousand, one hundred ninety-one".