1201201212191 has 2 divisors, whose sum is σ = 1201201212192. Its totient is φ = 1201201212190.

The previous prime is 1201201212187. The next prime is 1201201212193. The reversal of 1201201212191 is 1912121021021.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1912121021021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201201212191 - 2² = 1201201212187 is a prime.

Together with 1201201212193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201201212193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600606095 + 600600606096.

It is an arithmetic number, because the mean of its divisors is an integer number (600600606096).

Almost surely, 2^{1201201212191} is an apocalyptic number.

1201201212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201201212191 is an equidigital number, since it uses as much as digits as its factorization.

1201201212191 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 23.

The spelling of 1201201212191 in words is "one trillion, two hundred one billion, two hundred one million, two hundred twelve thousand, one hundred ninety-one".