129317194249 has 2 divisors, whose sum is σ = 129317194250. Its totient is φ = 129317194248.

The previous prime is 129317194229. The next prime is 129317194283. The reversal of 129317194249 is 942491713921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83024659600 + 46292534649 = 288140^2 + 215157^2 .

It is a cyclic number.

It is not a de Polignac number, because 129317194249 - 2⁵ = 129317194217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129317194196 and 129317194205.

It is not a weakly prime, because it can be changed into another prime (129317194229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64658597124 + 64658597125.

It is an arithmetic number, because the mean of its divisors is an integer number (64658597125).

Almost surely, 2^129317194249 is an apocalyptic number.

It is an amenable number.

129317194249 is a deficient number, since it is larger than the sum of its proper divisors (1).

129317194249 is an equidigital number, since it uses as much as digits as its factorization.

129317194249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The spelling of 129317194249 in words is "one hundred twenty-nine billion, three hundred seventeen million, one hundred ninety-four thousand, two hundred forty-nine".