163638089 has 4 divisors (see below), whose sum is σ = 172250640. Its totient is φ = 155025540.

The previous prime is 163638071. The next prime is 163638109. The reversal of 163638089 is 980836361.

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 163638089 - 2¹⁶ = 163572553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163638019) 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 in 3 ways as a sum of consecutive naturals, for example, 4306247 + ... + 4306284.

It is an arithmetic number, because the mean of its divisors is an integer number (43062660).

Almost surely, 2^163638089 is an apocalyptic number.

163638089 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

163638089 is a deficient number, since it is larger than the sum of its proper divisors (8612551).

163638089 is an equidigital number, since it uses as much as digits as its factorization.

163638089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8612550.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 163638089 is about 12792.1104200988. The cubic root of 163638089 is about 546.9674299673.

The spelling of 163638089 in words is "one hundred sixty-three million, six hundred thirty-eight thousand, eighty-nine".