163616191 has 4 divisors (see below), whose sum is σ = 163690632. Its totient is φ = 163541752.

The previous prime is 163616147. The next prime is 163616209. The reversal of 163616191 is 191616361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191616361 = 4993 ⋅38377.

It is a cyclic number.

It is not a de Polignac number, because 163616191 - 2⁹ = 163615679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163626191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33820 + ... + 38353.

It is an arithmetic number, because the mean of its divisors is an integer number (40922658).

Almost surely, 2^163616191 is an apocalyptic number.

163616191 is a deficient number, since it is larger than the sum of its proper divisors (74441).

163616191 is an equidigital number, since it uses as much as digits as its factorization.

163616191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74440.

The product of its digits is 5832, while the sum is 34.

The square root of 163616191 is about 12791.2544732720. The cubic root of 163616191 is about 546.9430305397.

The spelling of 163616191 in words is "one hundred sixty-three million, six hundred sixteen thousand, one hundred ninety-one".