129994937873 has 2 divisors, whose sum is σ = 129994937874. Its totient is φ = 129994937872.

The previous prime is 129994937819. The next prime is 129994937887. The reversal of 129994937873 is 378739499921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79985455489 + 50009482384 = 282817^2 + 223628^2 .

It is a cyclic number.

It is not a de Polignac number, because 129994937873 - 2¹⁰ = 129994936849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129994937797 and 129994937806.

It is not a weakly prime, because it can be changed into another prime (129994937273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64997468936 + 64997468937.

It is an arithmetic number, because the mean of its divisors is an integer number (64997468937).

Almost surely, 2^129994937873 is an apocalyptic number.

It is an amenable number.

129994937873 is a deficient number, since it is larger than the sum of its proper divisors (1).

129994937873 is an equidigital number, since it uses as much as digits as its factorization.

129994937873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 71.

The spelling of 129994937873 in words is "one hundred twenty-nine billion, nine hundred ninety-four million, nine hundred thirty-seven thousand, eight hundred seventy-three".