12122191 has 2 divisors, whose sum is σ = 12122192. Its totient is φ = 12122190.

The previous prime is 12122189. The next prime is 12122221. The reversal of 12122191 is 19122121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12122191 - 2¹ = 12122189 is a prime.

Together with 12122189, 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 (12122111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061095 + 6061096.

It is an arithmetic number, because the mean of its divisors is an integer number (6061096).

Almost surely, 2^12122191 is an apocalyptic number.

12122191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122191 is an equidigital number, since it uses as much as digits as its factorization.

12122191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

The square root of 12122191 is about 3481.6936970388. The cubic root of 12122191 is about 229.7173023263.

It can be divided in two parts, 1212 and 2191, that added together give a triangular number (3403 = T₈₂).

The spelling of 12122191 in words is "twelve million, one hundred twenty-two thousand, one hundred ninety-one".