163944481 has 8 divisors (see below), whose sum is σ = 173712384. Its totient is φ = 154190400.

The previous prime is 163944479. The next prime is 163944493. The reversal of 163944481 is 184449361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163944481 - 2¹ = 163944479 is a prime.

It is a super-2 number, since 2×163944481² = 53755585700718722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163954481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30696 + ... + 35638.

It is an arithmetic number, because the mean of its divisors is an integer number (21714048).

Almost surely, 2^163944481 is an apocalyptic number.

It is an amenable number.

163944481 is a deficient number, since it is larger than the sum of its proper divisors (9767903).

163944481 is a wasteful number, since it uses less digits than its factorization.

163944481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911.

The product of its digits is 82944, while the sum is 40.

The square root of 163944481 is about 12804.0806386089. The cubic root of 163944481 is about 547.3085933227.

The spelling of 163944481 in words is "one hundred sixty-three million, nine hundred forty-four thousand, four hundred eighty-one".