129317194449 has 9 divisors (see below), whose sum is σ = 186793061403. Its totient is φ = 86210743752.

The previous prime is 129317194397. The next prime is 129317194511. The reversal of 129317194449 is 944491713921.

It is a happy number.

The square root of 129317194449 is 359607.

It is a perfect power (a square), and thus also a powerful number.

129317194449 is a `hidden beast` number, since 1 + 2 + 9 + 3 + 1 + 7 + 194 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106182784449 + 23134410000 = 325857^2 + 152100^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 129317194449 - 2¹¹ = 129317192401 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129317194395 and 129317194404.

It is not an unprimeable number, because it can be changed into a prime (129317194249) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1018887 + ... + 1138755.

Almost surely, 2^129317194449 is an apocalyptic number.

129317194449 is the 359607-th square number.

129317194449 is the 179804-th centered octagonal number.

It is an amenable number.

129317194449 is a deficient number, since it is larger than the sum of its proper divisors (57475866954).

129317194449 is an frugal number, since it uses more digits than its factorization.

129317194449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239744 (or 119872 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 129317194449 in words is "one hundred twenty-nine billion, three hundred seventeen million, one hundred ninety-four thousand, four hundred forty-nine".