1212222191 has 2 divisors, whose sum is σ = 1212222192. Its totient is φ = 1212222190.

The previous prime is 1212222181. The next prime is 1212222203. The reversal of 1212222191 is 1912222121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212222191 - 2³⁰ = 138480367 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212222181) 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, 606111095 + 606111096.

It is an arithmetic number, because the mean of its divisors is an integer number (606111096).

Almost surely, 2^1212222191 is an apocalyptic number.

1212222191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212222191 is an equidigital number, since it uses as much as digits as its factorization.

1212222191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 1212222191 is about 34816.9813596756. The cubic root of 1212222191 is about 1066.2541716336.

The spelling of 1212222191 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred ninety-one".