129844369 has 2 divisors, whose sum is σ = 129844370. Its totient is φ = 129844368.

The previous prime is 129844331. The next prime is 129844441. The reversal of 129844369 is 963448921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 29844369 = 10000^2 + 5463^2 .

It is an emirp because it is prime and its reverse (963448921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129844369 - 2⁷ = 129844241 is a prime.

It is a super-2 number, since 2×129844369² = 33719120322016322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129844069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64922184 + 64922185.

It is an arithmetic number, because the mean of its divisors is an integer number (64922185).

Almost surely, 2^129844369 is an apocalyptic number.

It is an amenable number.

129844369 is a deficient number, since it is larger than the sum of its proper divisors (1).

129844369 is an equidigital number, since it uses as much as digits as its factorization.

129844369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The square root of 129844369 is about 11394.9273363194. The cubic root of 129844369 is about 506.3774686082.

The spelling of 129844369 in words is "one hundred twenty-nine million, eight hundred forty-four thousand, three hundred sixty-nine".