12191691137 has 2 divisors, whose sum is σ = 12191691138. Its totient is φ = 12191691136.

The previous prime is 12191691133. The next prime is 12191691181. The reversal of 12191691137 is 73119619121.

12191691137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9015692401 + 3175998736 = 94951^2 + 56356^2 .

It is a cyclic number.

It is not a de Polignac number, because 12191691137 - 2² = 12191691133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12191691094 and 12191691103.

It is not a weakly prime, because it can be changed into another prime (12191691133) 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, 6095845568 + 6095845569.

It is an arithmetic number, because the mean of its divisors is an integer number (6095845569).

Almost surely, 2^12191691137 is an apocalyptic number.

It is an amenable number.

12191691137 is a deficient number, since it is larger than the sum of its proper divisors (1).

12191691137 is an equidigital number, since it uses as much as digits as its factorization.

12191691137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 41.

The spelling of 12191691137 in words is "twelve billion, one hundred ninety-one million, six hundred ninety-one thousand, one hundred thirty-seven".