444405691 has 2 divisors, whose sum is σ = 444405692. Its totient is φ = 444405690.

The previous prime is 444405671. The next prime is 444405697. The reversal of 444405691 is 196504444.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444405691 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 444405691.

It is not a weakly prime, because it can be changed into another prime (444405697) 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, 222202845 + 222202846.

It is an arithmetic number, because the mean of its divisors is an integer number (222202846).

Almost surely, 2^444405691 is an apocalyptic number.

444405691 is a deficient number, since it is larger than the sum of its proper divisors (1).

444405691 is an equidigital number, since it uses as much as digits as its factorization.

444405691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 444405691 is about 21080.9319291155. The cubic root of 444405691 is about 763.1206469143.

It can be divided in two parts, 444405 and 691, that added together give a triangular number (445096 = T₉₄₃).

The spelling of 444405691 in words is "four hundred forty-four million, four hundred five thousand, six hundred ninety-one".