12138917899 has 2 divisors, whose sum is σ = 12138917900. Its totient is φ = 12138917898.

The previous prime is 12138917891. The next prime is 12138917951. The reversal of 12138917899 is 99871983121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12138917899 - 2³ = 12138917891 is a prime.

It is not a weakly prime, because it can be changed into another prime (12138917891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069458949 + 6069458950.

It is an arithmetic number, because the mean of its divisors is an integer number (6069458950).

Almost surely, 2^12138917899 is an apocalyptic number.

12138917899 is a deficient number, since it is larger than the sum of its proper divisors (1).

12138917899 is an equidigital number, since it uses as much as digits as its factorization.

12138917899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The spelling of 12138917899 in words is "twelve billion, one hundred thirty-eight million, nine hundred seventeen thousand, eight hundred ninety-nine".