1211162191 has 2 divisors, whose sum is σ = 1211162192. Its totient is φ = 1211162190.

The previous prime is 1211162179. The next prime is 1211162237. The reversal of 1211162191 is 1912611121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211162191 - 2¹⁷ = 1211031119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211162791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605581095 + 605581096.

It is an arithmetic number, because the mean of its divisors is an integer number (605581096).

Almost surely, 2^1211162191 is an apocalyptic number.

1211162191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211162191 is an equidigital number, since it uses as much as digits as its factorization.

1211162191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 25.

The square root of 1211162191 is about 34801.7555735339. The cubic root of 1211162191 is about 1065.9432938025.

The spelling of 1211162191 in words is "one billion, two hundred eleven million, one hundred sixty-two thousand, one hundred ninety-one".