1311932191 has 2 divisors, whose sum is σ = 1311932192. Its totient is φ = 1311932190.

The previous prime is 1311932093. The next prime is 1311932203. The reversal of 1311932191 is 1912391131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311932191 - 2⁹ = 1311931679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311932491) 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, 655966095 + 655966096.

It is an arithmetic number, because the mean of its divisors is an integer number (655966096).

Almost surely, 2^1311932191 is an apocalyptic number.

1311932191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311932191 is an equidigital number, since it uses as much as digits as its factorization.

1311932191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 31.

The square root of 1311932191 is about 36220.6045090360. The cubic root of 1311932191 is about 1094.7218745549.

The spelling of 1311932191 in words is "one billion, three hundred eleven million, nine hundred thirty-two thousand, one hundred ninety-one".