441643613891 has 2 divisors, whose sum is σ = 441643613892. Its totient is φ = 441643613890.

The previous prime is 441643613863. The next prime is 441643613897. The reversal of 441643613891 is 198316346144.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-441643613891 is a prime.

It is not a weakly prime, because it can be changed into another prime (441643613897) 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, 220821806945 + 220821806946.

It is an arithmetic number, because the mean of its divisors is an integer number (220821806946).

Almost surely, 2^441643613891 is an apocalyptic number.

441643613891 is a deficient number, since it is larger than the sum of its proper divisors (1).

441643613891 is an equidigital number, since it uses as much as digits as its factorization.

441643613891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 50.

The spelling of 441643613891 in words is "four hundred forty-one billion, six hundred forty-three million, six hundred thirteen thousand, eight hundred ninety-one".