817345321 has 8 divisors (see below), whose sum is σ = 881914824. Its totient is φ = 753018240.

The previous prime is 817345307. The next prime is 817345343. The reversal of 817345321 is 123543718.

It can be written as a sum of positive squares in 4 ways, for example, as 118483225 + 698862096 = 10885^2 + 26436^2 .

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

It is not a de Polignac number, because 817345321 - 2⁵ = 817345289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817345381) 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, 53566 + ... + 67111.

It is an arithmetic number, because the mean of its divisors is an integer number (110239353).

Almost surely, 2^817345321 is an apocalyptic number.

It is an amenable number.

817345321 is a deficient number, since it is larger than the sum of its proper divisors (64569503).

817345321 is a wasteful number, since it uses less digits than its factorization.

817345321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121211.

The product of its digits is 20160, while the sum is 34.

The square root of 817345321 is about 28589.2518440060. The cubic root of 817345321 is about 934.9790079838.

The spelling of 817345321 in words is "eight hundred seventeen million, three hundred forty-five thousand, three hundred twenty-one".