163689983 has 4 divisors (see below), whose sum is σ = 164154048. Its totient is φ = 163225920.

The previous prime is 163689973. The next prime is 163690001. The reversal of 163689983 is 389986361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389986361 = 277 ⋅1407893.

It is a cyclic number.

It is not a de Polignac number, because 163689983 - 2⁸ = 163689727 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163689913) 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, 231503 + ... + 232208.

It is an arithmetic number, because the mean of its divisors is an integer number (41038512).

Almost surely, 2^163689983 is an apocalyptic number.

163689983 is a deficient number, since it is larger than the sum of its proper divisors (464065).

163689983 is an equidigital number, since it uses as much as digits as its factorization.

163689983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464064.

The product of its digits is 1679616, while the sum is 53.

The square root of 163689983 is about 12794.1386189145. The cubic root of 163689983 is about 547.0252431737.

It can be divided in two parts, 1636 and 89983, that added together give a palindrome (91619).

The spelling of 163689983 in words is "one hundred sixty-three million, six hundred eighty-nine thousand, nine hundred eighty-three".