129206201 has 2 divisors, whose sum is σ = 129206202. Its totient is φ = 129206200.

The previous prime is 129206179. The next prime is 129206221. The reversal of 129206201 is 102602921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93624976 + 35581225 = 9676^2 + 5965^2 .

It is an emirp because it is prime and its reverse (102602921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129206201 - 2²⁶ = 62097337 is a prime.

It is not a weakly prime, because it can be changed into another prime (129206221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64603100 + 64603101.

It is an arithmetic number, because the mean of its divisors is an integer number (64603101).

Almost surely, 2^129206201 is an apocalyptic number.

It is an amenable number.

129206201 is a deficient number, since it is larger than the sum of its proper divisors (1).

129206201 is an equidigital number, since it uses as much as digits as its factorization.

129206201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 129206201 is about 11366.8905598673. The cubic root of 129206201 is about 505.5465128806.

The spelling of 129206201 in words is "one hundred twenty-nine million, two hundred six thousand, two hundred one".