129131245 has 8 divisors (see below), whose sum is σ = 155018520. Its totient is φ = 103264320.

The previous prime is 129131237. The next prime is 129131281. The reversal of 129131245 is 542131921.

It can be written as a sum of positive squares in 4 ways, for example, as 66357316 + 62773929 = 8146^2 + 7923^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129131245 - 2³ = 129131237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21915 + ... + 27175.

It is an arithmetic number, because the mean of its divisors is an integer number (19377315).

Almost surely, 2^129131245 is an apocalyptic number.

It is an amenable number.

129131245 is a deficient number, since it is larger than the sum of its proper divisors (25887275).

129131245 is an equidigital number, since it uses as much as digits as its factorization.

129131245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10175.

The product of its digits is 2160, while the sum is 28.

The square root of 129131245 is about 11363.5929617353. The cubic root of 129131245 is about 505.4487335836.

The spelling of 129131245 in words is "one hundred twenty-nine million, one hundred thirty-one thousand, two hundred forty-five".