129285197 has 2 divisors, whose sum is σ = 129285198. Its totient is φ = 129285196.

The previous prime is 129285137. The next prime is 129285209. The reversal of 129285197 is 791582921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106110601 + 23174596 = 10301^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 129285197 - 2¹⁴ = 129268813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129285127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64642598 + 64642599.

It is an arithmetic number, because the mean of its divisors is an integer number (64642599).

Almost surely, 2^129285197 is an apocalyptic number.

It is an amenable number.

129285197 is a deficient number, since it is larger than the sum of its proper divisors (1).

129285197 is an equidigital number, since it uses as much as digits as its factorization.

129285197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 129285197 is about 11370.3648578223. The cubic root of 129285197 is about 505.6495213943.

The spelling of 129285197 in words is "one hundred twenty-nine million, two hundred eighty-five thousand, one hundred ninety-seven".