817294321 has 2 divisors, whose sum is σ = 817294322. Its totient is φ = 817294320.

The previous prime is 817294319. The next prime is 817294337. The reversal of 817294321 is 123492718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 788991921 + 28302400 = 28089^2 + 5320^2 .

It is a cyclic number.

It is not a de Polignac number, because 817294321 - 2¹ = 817294319 is a prime.

Together with 817294319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (817294301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408647160 + 408647161.

It is an arithmetic number, because the mean of its divisors is an integer number (408647161).

Almost surely, 2^817294321 is an apocalyptic number.

It is an amenable number.

817294321 is a deficient number, since it is larger than the sum of its proper divisors (1).

817294321 is an equidigital number, since it uses as much as digits as its factorization.

817294321 is an evil number, because the sum of its binary digits is even.

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

The square root of 817294321 is about 28588.3598864993. The cubic root of 817294321 is about 934.9595609113.

The spelling of 817294321 in words is "eight hundred seventeen million, two hundred ninety-four thousand, three hundred twenty-one".