163181 has 2 divisors, whose sum is σ = 163182. Its totient is φ = 163180.

The previous prime is 163171. The next prime is 163193. The reversal of 163181 is 181361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 67081 = 310^2 + 259^2 .

It is an emirp because it is prime and its reverse (181361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163181 - 2⁶ = 163117 is a prime.

It is a super-2 number, since 2×163181² = 53256077522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81590 + 81591.

It is an arithmetic number, because the mean of its divisors is an integer number (81591).

2¹⁶³¹⁸¹ is an apocalyptic number.

It is an amenable number.

163181 is a deficient number, since it is larger than the sum of its proper divisors (1).

163181 is an equidigital number, since it uses as much as digits as its factorization.

163181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 163181 is about 403.9566808459. The cubic root of 163181 is about 54.6457675086.

The spelling of 163181 in words is "one hundred sixty-three thousand, one hundred eighty-one".