12491946197 has 2 divisors, whose sum is σ = 12491946198. Its totient is φ = 12491946196.

The previous prime is 12491946167. The next prime is 12491946221. The reversal of 12491946197 is 79164919421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9285442321 + 3206503876 = 96361^2 + 56626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491946197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12491946167) 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, 6245973098 + 6245973099.

It is an arithmetic number, because the mean of its divisors is an integer number (6245973099).

Almost surely, 2^12491946197 is an apocalyptic number.

It is an amenable number.

12491946197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491946197 is an equidigital number, since it uses as much as digits as its factorization.

12491946197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The spelling of 12491946197 in words is "twelve billion, four hundred ninety-one million, nine hundred forty-six thousand, one hundred ninety-seven".