163985869 has 4 divisors (see below), whose sum is σ = 167079996. Its totient is φ = 160891744.

The previous prime is 163985863. The next prime is 163985879. The reversal of 163985869 is 968589361.

It is a happy number.

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 132480100 + 31505769 = 11510^2 + 5613^2 .

It is a cyclic number.

It is not a de Polignac number, because 163985869 - 2¹⁹ = 163461581 is a prime.

It is a super-2 number, since 2×163985869² = 53782730463370322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163985863) 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, 1546984 + ... + 1547089.

It is an arithmetic number, because the mean of its divisors is an integer number (41769999).

Almost surely, 2^163985869 is an apocalyptic number.

It is an amenable number.

163985869 is a deficient number, since it is larger than the sum of its proper divisors (3094127).

163985869 is an equidigital number, since it uses as much as digits as its factorization.

163985869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094126.

The product of its digits is 2799360, while the sum is 55.

The square root of 163985869 is about 12805.6967401231. The cubic root of 163985869 is about 547.3546457058.

The spelling of 163985869 in words is "one hundred sixty-three million, nine hundred eighty-five thousand, eight hundred sixty-nine".