12641991149 has 2 divisors, whose sum is σ = 12641991150. Its totient is φ = 12641991148.

The previous prime is 12641991143. The next prime is 12641991179. The reversal of 12641991149 is 94119914621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6836313124 + 5805678025 = 82682^2 + 76195^2 .

It is an emirp because it is prime and its reverse (94119914621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12641991149 - 2¹⁶ = 12641925613 is a prime.

It is a super-2 number, since 2×12641991149² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12641991143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320995574 + 6320995575.

It is an arithmetic number, because the mean of its divisors is an integer number (6320995575).

Almost surely, 2^12641991149 is an apocalyptic number.

It is an amenable number.

12641991149 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641991149 is an equidigital number, since it uses as much as digits as its factorization.

12641991149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The spelling of 12641991149 in words is "twelve billion, six hundred forty-one million, nine hundred ninety-one thousand, one hundred forty-nine".