444540331 has 2 divisors, whose sum is σ = 444540332. Its totient is φ = 444540330.

The previous prime is 444540323. The next prime is 444540413. The reversal of 444540331 is 133045444.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 444540331 - 2³ = 444540323 is a prime.

It is a super-2 number, since 2×444540331² = 395232211771179122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 444540331.

It is not a weakly prime, because it can be changed into another prime (444540631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222270165 + 222270166.

It is an arithmetic number, because the mean of its divisors is an integer number (222270166).

Almost surely, 2^444540331 is an apocalyptic number.

444540331 is a deficient number, since it is larger than the sum of its proper divisors (1).

444540331 is an equidigital number, since it uses as much as digits as its factorization.

444540331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 444540331 is about 21084.1250944876. The cubic root of 444540331 is about 763.1977057755.

Adding to 444540331 its reverse (133045444), we get a palindrome (577585775).

The spelling of 444540331 in words is "four hundred forty-four million, five hundred forty thousand, three hundred thirty-one".