173221489 has 8 divisors (see below), whose sum is σ = 198286208. Its totient is φ = 148236480.

The previous prime is 173221453. The next prime is 173221493. The reversal of 173221489 is 984122371.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 173221489 - 2⁷ = 173221361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173221439) 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 7 ways as a sum of consecutive naturals, for example, 15192 + ... + 24025.

It is an arithmetic number, because the mean of its divisors is an integer number (24785776).

Almost surely, 2^173221489 is an apocalyptic number.

It is an amenable number.

173221489 is a deficient number, since it is larger than the sum of its proper divisors (25064719).

173221489 is an equidigital number, since it uses as much as digits as its factorization.

173221489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39855.

The product of its digits is 24192, while the sum is 37.

The square root of 173221489 is about 13161.3634931948. The cubic root of 173221489 is about 557.4431577510.

The spelling of 173221489 in words is "one hundred seventy-three million, two hundred twenty-one thousand, four hundred eighty-nine".