129907681245 has 24 divisors (see below), whose sum is σ = 225288999000. Its totient is φ = 69248501376.

The previous prime is 129907681243. The next prime is 129907681247. The reversal of 129907681245 is 542186709921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129907681243) and next prime (129907681247).

It can be written as a sum of positive squares in 4 ways, for example, as 75947643396 + 53960037849 = 275586^2 + 232293^2 .

It is not a de Polignac number, because 129907681245 - 2¹ = 129907681243 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129907681191 and 129907681200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129907681243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 652890 + ... + 828299.

It is an arithmetic number, because the mean of its divisors is an integer number (9387041625).

Almost surely, 2^129907681245 is an apocalyptic number.

129907681245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129907681245 is a deficient number, since it is larger than the sum of its proper divisors (95381317755).

129907681245 is a wasteful number, since it uses less digits than its factorization.

129907681245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483149 (or 1483146 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 129907681245 in words is "one hundred twenty-nine billion, nine hundred seven million, six hundred eighty-one thousand, two hundred forty-five".