163871909 has 2 divisors, whose sum is σ = 163871910. Its totient is φ = 163871908.

The previous prime is 163871893. The next prime is 163871971. The reversal of 163871909 is 909178361.

163871909 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., 121660900 + 42211009 = 11030^2 + 6497^2 .

It is a cyclic number.

It is not a de Polignac number, because 163871909 - 2⁴ = 163871893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163871909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163871989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81935954 + 81935955.

It is an arithmetic number, because the mean of its divisors is an integer number (81935955).

Almost surely, 2^163871909 is an apocalyptic number.

It is an amenable number.

163871909 is a deficient number, since it is larger than the sum of its proper divisors (1).

163871909 is an equidigital number, since it uses as much as digits as its factorization.

163871909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 163871909 is about 12801.2463846299. The cubic root of 163871909 is about 547.2278238224.

The spelling of 163871909 in words is "one hundred sixty-three million, eight hundred seventy-one thousand, nine hundred nine".