129854321 has 2 divisors, whose sum is σ = 129854322. Its totient is φ = 129854320.

The previous prime is 129854317. The next prime is 129854327. The reversal of 129854321 is 123458921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 11806096 = 10865^2 + 3436^2 .

It is an emirp because it is prime and its reverse (123458921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129854321 - 2² = 129854317 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (129854327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64927160 + 64927161.

It is an arithmetic number, because the mean of its divisors is an integer number (64927161).

Almost surely, 2^129854321 is an apocalyptic number.

It is an amenable number.

129854321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129854321 is an equidigital number, since it uses as much as digits as its factorization.

129854321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 129854321 is about 11395.3640134925. The cubic root of 129854321 is about 506.3904054799.

The spelling of 129854321 in words is "one hundred twenty-nine million, eight hundred fifty-four thousand, three hundred twenty-one".