163485181 has 2 divisors, whose sum is σ = 163485182. Its totient is φ = 163485180.

The previous prime is 163485169. The next prime is 163485187. The reversal of 163485181 is 181584361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158004900 + 5480281 = 12570^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 163485181 - 2¹⁵ = 163452413 is a prime.

It is a super-2 number, since 2×163485181² = 53454808813205522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163485181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163485187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81742590 + 81742591.

It is an arithmetic number, because the mean of its divisors is an integer number (81742591).

Almost surely, 2^163485181 is an apocalyptic number.

It is an amenable number.

163485181 is a deficient number, since it is larger than the sum of its proper divisors (1).

163485181 is an equidigital number, since it uses as much as digits as its factorization.

163485181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 163485181 is about 12786.1323706585. The cubic root of 163485181 is about 546.7970096608.

The spelling of 163485181 in words is "one hundred sixty-three million, four hundred eighty-five thousand, one hundred eighty-one".