163918913 has 8 divisors (see below), whose sum is σ = 173677608. Its totient is φ = 154173184.

The previous prime is 163918901. The next prime is 163918919. The reversal of 163918913 is 319819361.

It can be written as a sum of positive squares in 4 ways, for example, as 50027329 + 113891584 = 7073^2 + 10672^2 .

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 163918913 - 2⁴ = 163918897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163918919) 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, 37595 + ... + 41727.

It is an arithmetic number, because the mean of its divisors is an integer number (21709701).

Almost surely, 2^163918913 is an apocalyptic number.

It is an amenable number.

163918913 is a deficient number, since it is larger than the sum of its proper divisors (9758695).

163918913 is a wasteful number, since it uses less digits than its factorization.

163918913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483.

The product of its digits is 34992, while the sum is 41.

The square root of 163918913 is about 12803.0821679781. The cubic root of 163918913 is about 547.2801399634.

The spelling of 163918913 in words is "one hundred sixty-three million, nine hundred eighteen thousand, nine hundred thirteen".