163909 has 2 divisors, whose sum is σ = 163910. Its totient is φ = 163908.

The previous prime is 163901. The next prime is 163927. The reversal of 163909 is 909361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142884 + 21025 = 378^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 163909 - 2³ = 163901 is a prime.

163909 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81954 + 81955.

It is an arithmetic number, because the mean of its divisors is an integer number (81955).

2¹⁶³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

163909 is a deficient number, since it is larger than the sum of its proper divisors (1).

163909 is an equidigital number, since it uses as much as digits as its factorization.

163909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 163909 is about 404.8567647947. The cubic root of 163909 is about 54.7269107481.

The spelling of 163909 in words is "one hundred sixty-three thousand, nine hundred nine".