394731765089 has 2 divisors, whose sum is σ = 394731765090. Its totient is φ = 394731765088.

The previous prime is 394731765079. The next prime is 394731765101. The reversal of 394731765089 is 980567137493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376185955600 + 18545809489 = 613340^2 + 136183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394731765089 is a prime.

It is not a weakly prime, because it can be changed into another prime (394731765079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197365882544 + 197365882545.

It is an arithmetic number, because the mean of its divisors is an integer number (197365882545).

Almost surely, 2^394731765089 is an apocalyptic number.

It is an amenable number.

394731765089 is a deficient number, since it is larger than the sum of its proper divisors (1).

394731765089 is an equidigital number, since it uses as much as digits as its factorization.

394731765089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34292160, while the sum is 62.

The spelling of 394731765089 in words is "three hundred ninety-four billion, seven hundred thirty-one million, seven hundred sixty-five thousand, eighty-nine".