394225845491 has 4 divisors (see below), whose sum is σ = 394229347392. Its totient is φ = 394222343592.

The previous prime is 394225845463. The next prime is 394225845511. The reversal of 394225845491 is 194548522493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194548522493 = 13 ⋅14965270961.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394225845491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394224845491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576280 + ... + 1809173.

It is an arithmetic number, because the mean of its divisors is an integer number (98557336848).

Almost surely, 2^394225845491 is an apocalyptic number.

394225845491 is a deficient number, since it is larger than the sum of its proper divisors (3501901).

394225845491 is a wasteful number, since it uses less digits than its factorization.

394225845491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501900.

The product of its digits is 12441600, while the sum is 56.

The spelling of 394225845491 in words is "three hundred ninety-four billion, two hundred twenty-five million, eight hundred forty-five thousand, four hundred ninety-one".