394564369321 has 2 divisors, whose sum is σ = 394564369322. Its totient is φ = 394564369320.

The previous prime is 394564369247. The next prime is 394564369327. The reversal of 394564369321 is 123963465493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322101651600 + 72462717721 = 567540^2 + 269189^2 .

It is a cyclic number.

It is not a de Polignac number, because 394564369321 - 2²³ = 394555980713 is a prime.

It is not a weakly prime, because it can be changed into another prime (394564369327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197282184660 + 197282184661.

It is an arithmetic number, because the mean of its divisors is an integer number (197282184661).

Almost surely, 2^394564369321 is an apocalyptic number.

It is an amenable number.

394564369321 is a deficient number, since it is larger than the sum of its proper divisors (1).

394564369321 is an equidigital number, since it uses as much as digits as its factorization.

394564369321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 55.

The spelling of 394564369321 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-nine thousand, three hundred twenty-one".