163409 has 2 divisors, whose sum is σ = 163410. Its totient is φ = 163408.

The previous prime is 163403. The next prime is 163411. The reversal of 163409 is 904361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102400 + 61009 = 320^2 + 247^2 .

It is an emirp because it is prime and its reverse (904361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163409 - 2⁴ = 163393 is a prime.

Together with 163411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81704 + 81705.

It is an arithmetic number, because the mean of its divisors is an integer number (81705).

2¹⁶³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

163409 is a deficient number, since it is larger than the sum of its proper divisors (1).

163409 is an equidigital number, since it uses as much as digits as its factorization.

163409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 163409 is about 404.2387908155. The cubic root of 163409 is about 54.6712064113.

The spelling of 163409 in words is "one hundred sixty-three thousand, four hundred nine".