444563381 has 2 divisors, whose sum is σ = 444563382. Its totient is φ = 444563380.

The previous prime is 444563321. The next prime is 444563393. The reversal of 444563381 is 183365444.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417834481 + 26728900 = 20441^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 444563381 - 2¹⁴ = 444546997 is a prime.

It is a super-2 number, since 2×444563381² = 395273199452302322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444563321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222281690 + 222281691.

It is an arithmetic number, because the mean of its divisors is an integer number (222281691).

Almost surely, 2^444563381 is an apocalyptic number.

It is an amenable number.

444563381 is a deficient number, since it is larger than the sum of its proper divisors (1).

444563381 is an equidigital number, since it uses as much as digits as its factorization.

444563381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 38.

The square root of 444563381 is about 21084.6717071905. The cubic root of 444563381 is about 763.2108964820.

The spelling of 444563381 in words is "four hundred forty-four million, five hundred sixty-three thousand, three hundred eighty-one".