12909492191 has 2 divisors, whose sum is σ = 12909492192. Its totient is φ = 12909492190.

The previous prime is 12909492179. The next prime is 12909492241. The reversal of 12909492191 is 19129490921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12909492191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12909492151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6454746095 + 6454746096.

It is an arithmetic number, because the mean of its divisors is an integer number (6454746096).

Almost surely, 2^12909492191 is an apocalyptic number.

12909492191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12909492191 is an equidigital number, since it uses as much as digits as its factorization.

12909492191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 47.

The spelling of 12909492191 in words is "twelve billion, nine hundred nine million, four hundred ninety-two thousand, one hundred ninety-one".