129001 has 2 divisors, whose sum is σ = 129002. Its totient is φ = 129000.

The previous prime is 128993. The next prime is 129011. The reversal of 129001 is 100921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104976 + 24025 = 324^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 129001 - 2³ = 128993 is a prime.

It is not a weakly prime, because it can be changed into another prime (129011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64500 + 64501.

It is an arithmetic number, because the mean of its divisors is an integer number (64501).

2¹²⁹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

129001 is a deficient number, since it is larger than the sum of its proper divisors (1).

129001 is an equidigital number, since it uses as much as digits as its factorization.

129001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 129001 is about 359.1670920338. The cubic root of 129001 is about 50.5278740344.

Adding to 129001 its reverse (100921), we get a palindrome (229922).

The spelling of 129001 in words is "one hundred twenty-nine thousand, one".