129351719025 has 27 divisors (see below), whose sum is σ = 231692964321. Its totient is φ = 68984706240.

The previous prime is 129351719017. The next prime is 129351719111. The reversal of 129351719025 is 520917153921.

The square root of 129351719025 is 359655.

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

129351719025 is a `hidden beast` number, since 1 + 29 + 3 + 517 + 1 + 90 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5551889121 + 123799829904 = 74511^2 + 351852^2 .

It is not a de Polignac number, because 129351719025 - 2³ = 129351719017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5382837 + ... + 5406813.

Almost surely, 2^129351719025 is an apocalyptic number.

129351719025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129351719025 is the 359655-th square number.

129351719025 is the 179828-th centered octagonal number.

It is an amenable number.

129351719025 is a deficient number, since it is larger than the sum of its proper divisors (102341245296).

129351719025 is an frugal number, since it uses more digits than its factorization.

129351719025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47970 (or 23985 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The spelling of 129351719025 in words is "one hundred twenty-nine billion, three hundred fifty-one million, seven hundred nineteen thousand, twenty-five".