394564984321 has 2 divisors, whose sum is σ = 394564984322. Its totient is φ = 394564984320.

The previous prime is 394564984211. The next prime is 394564984379. The reversal of 394564984321 is 123489465493.

It is an a-pointer prime, because the next prime (394564984379) can be obtained adding 394564984321 to its sum of digits (58).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245000250625 + 149564733696 = 494975^2 + 386736^2 .

It is an emirp because it is prime and its reverse (123489465493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394564984321 - 2⁷ = 394564984193 is a prime.

It is not a weakly prime, because it can be changed into another prime (394564184321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197282492160 + 197282492161.

It is an arithmetic number, because the mean of its divisors is an integer number (197282492161).

Almost surely, 2^394564984321 is an apocalyptic number.

It is an amenable number.

394564984321 is a deficient number, since it is larger than the sum of its proper divisors (1).

394564984321 is an equidigital number, since it uses as much as digits as its factorization.

394564984321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22394880, while the sum is 58.

The spelling of 394564984321 in words is "three hundred ninety-four billion, five hundred sixty-four million, nine hundred eighty-four thousand, three hundred twenty-one".