147209 has 2 divisors, whose sum is σ = 147210. Its totient is φ = 147208.

The previous prime is 147197. The next prime is 147211. The reversal of 147209 is 902741.

147209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 2809 = 380^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 147209 - 2⁸ = 146953 is a prime.

Together with 147211, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73604 + 73605.

It is an arithmetic number, because the mean of its divisors is an integer number (73605).

2¹⁴⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

147209 is a deficient number, since it is larger than the sum of its proper divisors (1).

147209 is an equidigital number, since it uses as much as digits as its factorization.

147209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 147209 is about 383.6782506215. The cubic root of 147209 is about 52.8013209419.

The spelling of 147209 in words is "one hundred forty-seven thousand, two hundred nine".