129401 has 2 divisors, whose sum is σ = 129402. Its totient is φ = 129400.

The previous prime is 129379. The next prime is 129403. The reversal of 129401 is 104921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89401 + 40000 = 299^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 129401 - 2¹⁰ = 128377 is a prime.

It is a Sophie Germain prime.

Together with 129403, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

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 129401.

It is not a weakly prime, because it can be changed into another prime (129403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64700 + 64701.

It is an arithmetic number, because the mean of its divisors is an integer number (64701).

2¹²⁹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

129401 is a deficient number, since it is larger than the sum of its proper divisors (1).

129401 is an equidigital number, since it uses as much as digits as its factorization.

129401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 129401 is about 359.7235049312. The cubic root of 129401 is about 50.5800449365.

The spelling of 129401 in words is "one hundred twenty-nine thousand, four hundred one".