163441681 has 4 divisors (see below), whose sum is σ = 176014132. Its totient is φ = 150869232.

The previous prime is 163441673. The next prime is 163441687. The reversal of 163441681 is 186144361.

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 23232400 + 140209281 = 4820^2 + 11841^2 .

It is a cyclic number.

It is not a de Polignac number, because 163441681 - 2³ = 163441673 is a prime.

It is a super-2 number, since 2×163441681² = 53426366176211522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163441687) 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, 6286206 + ... + 6286231.

It is an arithmetic number, because the mean of its divisors is an integer number (44003533).

Almost surely, 2^163441681 is an apocalyptic number.

It is an amenable number.

163441681 is a deficient number, since it is larger than the sum of its proper divisors (12572451).

163441681 is a wasteful number, since it uses less digits than its factorization.

163441681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12572450.

The product of its digits is 13824, while the sum is 34.

The square root of 163441681 is about 12784.4311957944. The cubic root of 163441681 is about 546.7485082621.

The spelling of 163441681 in words is "one hundred sixty-three million, four hundred forty-one thousand, six hundred eighty-one".