163281473 has 4 divisors (see below), whose sum is σ = 164193840. Its totient is φ = 162369108.

The previous prime is 163281467. The next prime is 163281511. The reversal of 163281473 is 374182361.

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 163281473 - 2¹⁰ = 163280449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163281463) 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, 455915 + ... + 456272.

It is an arithmetic number, because the mean of its divisors is an integer number (41048460).

Almost surely, 2^163281473 is an apocalyptic number.

It is an amenable number.

163281473 is a deficient number, since it is larger than the sum of its proper divisors (912367).

163281473 is an equidigital number, since it uses as much as digits as its factorization.

163281473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912366.

The product of its digits is 24192, while the sum is 35.

The square root of 163281473 is about 12778.1639134893. The cubic root of 163281473 is about 546.5698061501.

The spelling of 163281473 in words is "one hundred sixty-three million, two hundred eighty-one thousand, four hundred seventy-three".