129201 has 4 divisors (see below), whose sum is σ = 172272. Its totient is φ = 86132.

The previous prime is 129197. The next prime is 129209. The reversal of 129201 is 102921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129201 - 2² = 129197 is a prime.

It is a D-number.

It is a Curzon number.

129201 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129201.

It is not an unprimeable number, because it can be changed into a prime (129209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21531 + ... + 21536.

It is an arithmetic number, because the mean of its divisors is an integer number (43068).

2¹²⁹²⁰¹ is an apocalyptic number.

It is an amenable number.

129201 is a deficient number, since it is larger than the sum of its proper divisors (43071).

129201 is an equidigital number, since it uses as much as digits as its factorization.

129201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43070.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 129201 is about 359.4454061467. The cubic root of 129201 is about 50.5539729453.

It can be divided in two parts, 12920 and 1, that added together give a palindrome (12921).

The spelling of 129201 in words is "one hundred twenty-nine thousand, two hundred one".