163381 has 4 divisors (see below), whose sum is σ = 172000. Its totient is φ = 154764.

The previous prime is 163367. The next prime is 163393. The reversal of 163381 is 183361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163381 - 2¹¹ = 161333 is a prime.

It is a super-2 number, since 2×163381² = 53386702322, 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 (163321) 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 3 ways as a sum of consecutive naturals, for example, 4281 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (43000).

2¹⁶³³⁸¹ is an apocalyptic number.

It is an amenable number.

163381 is a deficient number, since it is larger than the sum of its proper divisors (8619).

163381 is an equidigital number, since it uses as much as digits as its factorization.

163381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8618.

The product of its digits is 432, while the sum is 22.

The square root of 163381 is about 404.2041563369. The cubic root of 163381 is about 54.6680836106.

The spelling of 163381 in words is "one hundred sixty-three thousand, three hundred eighty-one".