163689133 has 4 divisors (see below), whose sum is σ = 163755900. Its totient is φ = 163622368.

The previous prime is 163689131. The next prime is 163689143. The reversal of 163689133 is 331986361.

163689133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103673124 + 60016009 = 10182^2 + 7747^2 .

It is a cyclic number.

It is not a de Polignac number, because 163689133 - 2¹ = 163689131 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163689131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29560 + ... + 34657.

It is an arithmetic number, because the mean of its divisors is an integer number (40938975).

Almost surely, 2^163689133 is an apocalyptic number.

It is an amenable number.

163689133 is a deficient number, since it is larger than the sum of its proper divisors (66767).

163689133 is an equidigital number, since it uses as much as digits as its factorization.

163689133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66766.

The product of its digits is 69984, while the sum is 40.

The square root of 163689133 is about 12794.1054005350. The cubic root of 163689133 is about 547.0242963183.

The spelling of 163689133 in words is "one hundred sixty-three million, six hundred eighty-nine thousand, one hundred thirty-three".