129659245 has 4 divisors (see below), whose sum is σ = 155591100. Its totient is φ = 103727392.

The previous prime is 129659237. The next prime is 129659269. The reversal of 129659245 is 542956921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542956921 = 13 ⋅41765917.

It can be written as a sum of positive squares in 2 ways, for example, as 63952009 + 65707236 = 7997^2 + 8106^2 .

It is a cyclic number.

It is not a de Polignac number, because 129659245 - 2³ = 129659237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12965920 + ... + 12965929.

It is an arithmetic number, because the mean of its divisors is an integer number (38897775).

Almost surely, 2^129659245 is an apocalyptic number.

It is an amenable number.

129659245 is a deficient number, since it is larger than the sum of its proper divisors (25931855).

129659245 is an equidigital number, since it uses as much as digits as its factorization.

129659245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25931854.

The product of its digits is 194400, while the sum is 43.

The square root of 129659245 is about 11386.8013506867. The cubic root of 129659245 is about 506.1367003476.

The spelling of 129659245 in words is "one hundred twenty-nine million, six hundred fifty-nine thousand, two hundred forty-five".