1391216191 has 2 divisors, whose sum is σ = 1391216192. Its totient is φ = 1391216190.

The previous prime is 1391216179. The next prime is 1391216213. The reversal of 1391216191 is 1916121931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391216191 - 2¹⁹ = 1390691903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391216891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695608095 + 695608096.

It is an arithmetic number, because the mean of its divisors is an integer number (695608096).

Almost surely, 2^1391216191 is an apocalyptic number.

1391216191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391216191 is an equidigital number, since it uses as much as digits as its factorization.

1391216191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 34.

The square root of 1391216191 is about 37299.0105900947. The cubic root of 1391216191 is about 1116.3444247973.

It can be divided in two parts, 13912 and 16191, that added together give a palindrome (30103).

The spelling of 1391216191 in words is "one billion, three hundred ninety-one million, two hundred sixteen thousand, one hundred ninety-one".