12840194491 has 2 divisors, whose sum is σ = 12840194492. Its totient is φ = 12840194490.

The previous prime is 12840194467. The next prime is 12840194501. The reversal of 12840194491 is 19449104821.

It is a strong prime.

It is an emirp because it is prime and its reverse (19449104821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12840194491 - 2⁷ = 12840194363 is a prime.

It is not a weakly prime, because it can be changed into another prime (12840198491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420097245 + 6420097246.

It is an arithmetic number, because the mean of its divisors is an integer number (6420097246).

Almost surely, 2^12840194491 is an apocalyptic number.

12840194491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840194491 is an equidigital number, since it uses as much as digits as its factorization.

12840194491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 12840194491 in words is "twelve billion, eight hundred forty million, one hundred ninety-four thousand, four hundred ninety-one".