394564184321 has 2 divisors, whose sum is σ = 394564184322. Its totient is φ = 394564184320.

The previous prime is 394564184297. The next prime is 394564184387. The reversal of 394564184321 is 123481465493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328804762225 + 65759422096 = 573415^2 + 256436^2 .

It is an emirp because it is prime and its reverse (123481465493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394564184321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394564184321.

It is not a weakly prime, because it can be changed into another prime (394564180321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197282092160 + 197282092161.

It is an arithmetic number, because the mean of its divisors is an integer number (197282092161).

Almost surely, 2^394564184321 is an apocalyptic number.

It is an amenable number.

394564184321 is a deficient number, since it is larger than the sum of its proper divisors (1).

394564184321 is an equidigital number, since it uses as much as digits as its factorization.

394564184321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 50.

The spelling of 394564184321 in words is "three hundred ninety-four billion, five hundred sixty-four million, one hundred eighty-four thousand, three hundred twenty-one".