12694321949 has 2 divisors, whose sum is σ = 12694321950. Its totient is φ = 12694321948.

The previous prime is 12694321919. The next prime is 12694322023. The reversal of 12694321949 is 94912349621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10428085924 + 2266236025 = 102118^2 + 47605^2 .

It is a cyclic number.

It is not a de Polignac number, because 12694321949 - 2²⁸ = 12425886493 is a prime.

It is a super-2 number, since 2×12694321949² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12694321897 and 12694321906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12694321919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6347160974 + 6347160975.

It is an arithmetic number, because the mean of its divisors is an integer number (6347160975).

Almost surely, 2^12694321949 is an apocalyptic number.

It is an amenable number.

12694321949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12694321949 is an equidigital number, since it uses as much as digits as its factorization.

12694321949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The spelling of 12694321949 in words is "twelve billion, six hundred ninety-four million, three hundred twenty-one thousand, nine hundred forty-nine".