163981983 has 24 divisors (see below), whose sum is σ = 254472624. Its totient is φ = 93533440.

The previous prime is 163981957. The next prime is 163981991. The reversal of 163981983 is 389189361.

It is not a de Polignac number, because 163981983 - 2⁹ = 163981471 is a prime.

It is a super-2 number, since 2×163981983² = 53780181497224578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163981933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7116 + ... + 19457.

It is an arithmetic number, because the mean of its divisors is an integer number (10603026).

Almost surely, 2^163981983 is an apocalyptic number.

163981983 is a deficient number, since it is larger than the sum of its proper divisors (90490641).

163981983 is a wasteful number, since it uses less digits than its factorization.

163981983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26615 (or 26604 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 163981983 is about 12805.5450098776. The cubic root of 163981983 is about 547.3503220874.

It can be divided in two parts, 16398 and 1983, that added together give a palindrome (18381).

The spelling of 163981983 in words is "one hundred sixty-three million, nine hundred eighty-one thousand, nine hundred eighty-three".