209142169 has 2 divisors, whose sum is σ = 209142170. Its totient is φ = 209142168.

The previous prime is 209142163. The next prime is 209142191. The reversal of 209142169 is 961241902.

209142169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204146944 + 4995225 = 14288^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 209142169 - 2³ = 209142161 is a prime.

It is a super-2 number, since 2×209142169² = 87480893708049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209142161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104571084 + 104571085.

It is an arithmetic number, because the mean of its divisors is an integer number (104571085).

Almost surely, 2^209142169 is an apocalyptic number.

It is an amenable number.

209142169 is a deficient number, since it is larger than the sum of its proper divisors (1).

209142169 is an equidigital number, since it uses as much as digits as its factorization.

209142169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 209142169 is about 14461.7484765847. The cubic root of 209142169 is about 593.5817446202.

The spelling of 209142169 in words is "two hundred nine million, one hundred forty-two thousand, one hundred sixty-nine".