171968321 has 8 divisors (see below), whose sum is σ = 196784640. Its totient is φ = 147214368.

The previous prime is 171968317. The next prime is 171968327. The reversal of 171968321 is 123869171.

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

It is not a de Polignac number, because 171968321 - 2² = 171968317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171968327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9521 + ... + 20846.

It is an arithmetic number, because the mean of its divisors is an integer number (24598080).

Almost surely, 2^171968321 is an apocalyptic number.

It is an amenable number.

171968321 is a deficient number, since it is larger than the sum of its proper divisors (24816319).

171968321 is an equidigital number, since it uses as much as digits as its factorization.

171968321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31183.

The product of its digits is 18144, while the sum is 38.

The square root of 171968321 is about 13113.6692424355. The cubic root of 171968321 is about 556.0956318519.

The spelling of 171968321 in words is "one hundred seventy-one million, nine hundred sixty-eight thousand, three hundred twenty-one".