129210397 has 2 divisors, whose sum is σ = 129210398. Its totient is φ = 129210396.

The previous prime is 129210391. The next prime is 129210407. The reversal of 129210397 is 793012921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85266756 + 43943641 = 9234^2 + 6629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129210397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129210391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64605198 + 64605199.

It is an arithmetic number, because the mean of its divisors is an integer number (64605199).

Almost surely, 2^129210397 is an apocalyptic number.

It is an amenable number.

129210397 is a deficient number, since it is larger than the sum of its proper divisors (1).

129210397 is an equidigital number, since it uses as much as digits as its factorization.

129210397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 129210397 is about 11367.0751295133. The cubic root of 129210397 is about 505.5519853997.

The spelling of 129210397 in words is "one hundred twenty-nine million, two hundred ten thousand, three hundred ninety-seven".