163898081 has 2 divisors, whose sum is σ = 163898082. Its totient is φ = 163898080.

The previous prime is 163898057. The next prime is 163898083. The reversal of 163898081 is 180898361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163840000 + 58081 = 12800^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 163898081 - 2⁶ = 163898017 is a prime.

It is a super-2 number, since 2×163898081² = 53725161910965122, which contains 22 as substring.

Together with 163898083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163898083) 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 as a sum of consecutive naturals, namely, 81949040 + 81949041.

It is an arithmetic number, because the mean of its divisors is an integer number (81949041).

Almost surely, 2^163898081 is an apocalyptic number.

It is an amenable number.

163898081 is a deficient number, since it is larger than the sum of its proper divisors (1).

163898081 is an equidigital number, since it uses as much as digits as its factorization.

163898081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 163898081 is about 12802.2685880277. The cubic root of 163898081 is about 547.2569548762.

The spelling of 163898081 in words is "one hundred sixty-three million, eight hundred ninety-eight thousand, eighty-one".