163336181 has 2 divisors, whose sum is σ = 163336182. Its totient is φ = 163336180.

The previous prime is 163336177. The next prime is 163336183. The reversal of 163336181 is 181633361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 38812900 = 11159^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 163336181 - 2² = 163336177 is a prime.

It is a super-2 number, since 2×163336181² = 53357416047329522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 163336183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163336183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81668090 + 81668091.

It is an arithmetic number, because the mean of its divisors is an integer number (81668091).

Almost surely, 2^163336181 is an apocalyptic number.

It is an amenable number.

163336181 is a deficient number, since it is larger than the sum of its proper divisors (1).

163336181 is an equidigital number, since it uses as much as digits as its factorization.

163336181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 163336181 is about 12780.3044173447. The cubic root of 163336181 is about 546.6308426769.

The spelling of 163336181 in words is "one hundred sixty-three million, three hundred thirty-six thousand, one hundred eighty-one".