163358981 has 8 divisors (see below), whose sum is σ = 167961600. Its totient is φ = 158803408.

The previous prime is 163358939. The next prime is 163358989. The reversal of 163358981 is 189853361.

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 163358981 - 2⁶ = 163358917 is a prime.

It is a super-2 number, since 2×163358981² = 53372313346716722, 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 (163358989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4661 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (20995200).

Almost surely, 2^163358981 is an apocalyptic number.

It is an amenable number.

163358981 is a deficient number, since it is larger than the sum of its proper divisors (4602619).

163358981 is a wasteful number, since it uses less digits than its factorization.

163358981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23523.

The product of its digits is 155520, while the sum is 44.

The square root of 163358981 is about 12781.1963837506. The cubic root of 163358981 is about 546.6562761179.

The spelling of 163358981 in words is "one hundred sixty-three million, three hundred fifty-eight thousand, nine hundred eighty-one".