210134209 has 2 divisors, whose sum is σ = 210134210. Its totient is φ = 210134208.

The previous prime is 210134173. The next prime is 210134219. The reversal of 210134209 is 902431012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 9628609 = 14160^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 210134209 - 2²¹ = 208037057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210134209.

It is not a weakly prime, because it can be changed into another prime (210134219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105067104 + 105067105.

It is an arithmetic number, because the mean of its divisors is an integer number (105067105).

Almost surely, 2^210134209 is an apocalyptic number.

It is an amenable number.

210134209 is a deficient number, since it is larger than the sum of its proper divisors (1).

210134209 is an equidigital number, since it uses as much as digits as its factorization.

210134209 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 22.

The square root of 210134209 is about 14496.0066570073. The cubic root of 210134209 is about 594.5187917750.

The spelling of 210134209 in words is "two hundred ten million, one hundred thirty-four thousand, two hundred nine".