129285643 has 2 divisors, whose sum is σ = 129285644. Its totient is φ = 129285642.

The previous prime is 129285641. The next prime is 129285677. The reversal of 129285643 is 346582921.

It is a weak prime.

It is an emirp because it is prime and its reverse (346582921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129285643 - 2¹ = 129285641 is a prime.

Together with 129285641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129285596 and 129285605.

It is not a weakly prime, because it can be changed into another prime (129285641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64642821 + 64642822.

It is an arithmetic number, because the mean of its divisors is an integer number (64642822).

Almost surely, 2^129285643 is an apocalyptic number.

129285643 is a deficient number, since it is larger than the sum of its proper divisors (1).

129285643 is an equidigital number, since it uses as much as digits as its factorization.

129285643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 129285643 is about 11370.3844701927. The cubic root of 129285643 is about 505.6501028464.

The spelling of 129285643 in words is "one hundred twenty-nine million, two hundred eighty-five thousand, six hundred forty-three".