864185321 has 2 divisors, whose sum is σ = 864185322. Its totient is φ = 864185320.

The previous prime is 864185317. The next prime is 864185323. The reversal of 864185321 is 123581468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 857611225 + 6574096 = 29285^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 864185321 - 2² = 864185317 is a prime.

Together with 864185323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (864185323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432092660 + 432092661.

It is an arithmetic number, because the mean of its divisors is an integer number (432092661).

Almost surely, 2^864185321 is an apocalyptic number.

It is an amenable number.

864185321 is a deficient number, since it is larger than the sum of its proper divisors (1).

864185321 is an equidigital number, since it uses as much as digits as its factorization.

864185321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 864185321 is about 29397.0291186031. The cubic root of 864185321 is about 952.5087232457.

The spelling of 864185321 in words is "eight hundred sixty-four million, one hundred eighty-five thousand, three hundred twenty-one".