129643 has 2 divisors, whose sum is σ = 129644.
Its totient is φ = 129642.
The previous prime is 129641. The next prime is 129671. The reversal of 129643 is 346921.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 129643 - 21 = 129641 is a prime.
Together with 129641, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (129641) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64821 + 64822.
It is an arithmetic number, because the mean of its divisors is an integer number (64822).
2129643 is an apocalyptic number.
129643 is a deficient number, since it is larger than the sum of its proper divisors (1).
129643 is an equidigital number, since it uses as much as digits as its factorization.
129643 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1296, while the sum is 25.
The square root of 129643 is about 360.0597172692.
The cubic root of 129643 is about 50.6115561518.
The spelling of 129643 in words is "one hundred twenty-nine thousand, six hundred forty-three".