129245 has 4 divisors (see below), whose sum is σ = 155100. Its totient is φ = 103392.

The previous prime is 129229. The next prime is 129263. The reversal of 129245 is 542921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17689 + 111556 = 133^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 129245 - 2⁴ = 129229 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12920 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (38775).

2¹²⁹²⁴⁵ is an apocalyptic number.

It is an amenable number.

129245 is a deficient number, since it is larger than the sum of its proper divisors (25855).

129245 is an equidigital number, since it uses as much as digits as its factorization.

129245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25854.

The product of its digits is 720, while the sum is 23.

The square root of 129245 is about 359.5066063371. The cubic root of 129245 is about 50.5597110907.

It can be divided in two parts, 12924 and 5, that multiplied together give a triangular number (64620 = T₃₅₉).

The spelling of 129245 in words is "one hundred twenty-nine thousand, two hundred forty-five".