163841209 has 4 divisors (see below), whose sum is σ = 187247104. Its totient is φ = 140435316.

The previous prime is 163841203. The next prime is 163841221. The reversal of 163841209 is 902148361.

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 not a de Polignac number, because 163841209 - 2⁷ = 163841081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163841203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11702937 + ... + 11702950.

It is an arithmetic number, because the mean of its divisors is an integer number (46811776).

Almost surely, 2^163841209 is an apocalyptic number.

It is an amenable number.

163841209 is a deficient number, since it is larger than the sum of its proper divisors (23405895).

163841209 is an equidigital number, since it uses as much as digits as its factorization.

163841209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23405894.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 163841209 is about 12800.0472264754. The cubic root of 163841209 is about 547.1936488713.

The spelling of 163841209 in words is "one hundred sixty-three million, eight hundred forty-one thousand, two hundred nine".