394611193409 has 2 divisors, whose sum is σ = 394611193410. Its totient is φ = 394611193408.

The previous prime is 394611193369. The next prime is 394611193423. The reversal of 394611193409 is 904391116493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261059683600 + 133551509809 = 510940^2 + 365447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394611193409 is a prime.

It is not a weakly prime, because it can be changed into another prime (394611193429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197305596704 + 197305596705.

It is an arithmetic number, because the mean of its divisors is an integer number (197305596705).

Almost surely, 2^394611193409 is an apocalyptic number.

It is an amenable number.

394611193409 is a deficient number, since it is larger than the sum of its proper divisors (1).

394611193409 is an equidigital number, since it uses as much as digits as its factorization.

394611193409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 394611193409 in words is "three hundred ninety-four billion, six hundred eleven million, one hundred ninety-three thousand, four hundred nine".