163391073 has 4 divisors (see below), whose sum is σ = 217854768. Its totient is φ = 108927380.

The previous prime is 163391071. The next prime is 163391077. The reversal of 163391073 is 370193361.

163391073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 163391073 - 2¹ = 163391071 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163391071) 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, 27231843 + ... + 27231848.

It is an arithmetic number, because the mean of its divisors is an integer number (54463692).

Almost surely, 2^163391073 is an apocalyptic number.

It is an amenable number.

163391073 is a deficient number, since it is larger than the sum of its proper divisors (54463695).

163391073 is an equidigital number, since it uses as much as digits as its factorization.

163391073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54463694.

The product of its (nonzero) digits is 10206, while the sum is 33.

The square root of 163391073 is about 12782.4517601280. The cubic root of 163391073 is about 546.6920707921.

The spelling of 163391073 in words is "one hundred sixty-three million, three hundred ninety-one thousand, seventy-three".