1131212191 has 2 divisors, whose sum is σ = 1131212192. Its totient is φ = 1131212190.

The previous prime is 1131212189. The next prime is 1131212237. The reversal of 1131212191 is 1912121311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131212191 - 2¹ = 1131212189 is a prime.

Together with 1131212189, 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 (1131212141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565606095 + 565606096.

It is an arithmetic number, because the mean of its divisors is an integer number (565606096).

Almost surely, 2^1131212191 is an apocalyptic number.

1131212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131212191 is an equidigital number, since it uses as much as digits as its factorization.

1131212191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 22.

The square root of 1131212191 is about 33633.4980488203. The cubic root of 1131212191 is about 1041.9527509420.

The spelling of 1131212191 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, one hundred ninety-one".