129644843 has 2 divisors, whose sum is σ = 129644844. Its totient is φ = 129644842.

The previous prime is 129644831. The next prime is 129644849. The reversal of 129644843 is 348446921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129644843 - 2²⁴ = 112867627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129644843.

It is not a weakly prime, because it can be changed into another prime (129644849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64822421 + 64822422.

It is an arithmetic number, because the mean of its divisors is an integer number (64822422).

Almost surely, 2^129644843 is an apocalyptic number.

129644843 is a deficient number, since it is larger than the sum of its proper divisors (1).

129644843 is an equidigital number, since it uses as much as digits as its factorization.

129644843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The square root of 129644843 is about 11386.1689342816. The cubic root of 129644843 is about 506.1179598131.

The spelling of 129644843 in words is "one hundred twenty-nine million, six hundred forty-four thousand, eight hundred forty-three".