394375521811 has 2 divisors, whose sum is σ = 394375521812. Its totient is φ = 394375521810.

The previous prime is 394375521781. The next prime is 394375521821. The reversal of 394375521811 is 118125573493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394375521811 - 2⁹ = 394375521299 is a prime.

It is not a weakly prime, because it can be changed into another prime (394375521821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197187760905 + 197187760906.

It is an arithmetic number, because the mean of its divisors is an integer number (197187760906).

Almost surely, 2^394375521811 is an apocalyptic number.

394375521811 is a deficient number, since it is larger than the sum of its proper divisors (1).

394375521811 is an equidigital number, since it uses as much as digits as its factorization.

394375521811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 49.

The spelling of 394375521811 in words is "three hundred ninety-four billion, three hundred seventy-five million, five hundred twenty-one thousand, eight hundred eleven".