1444815821 has 2 divisors, whose sum is σ = 1444815822. Its totient is φ = 1444815820.

The previous prime is 1444815793. The next prime is 1444815829. The reversal of 1444815821 is 1285184441.

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., 1407300196 + 37515625 = 37514^2 + 6125^2 .

It is an emirp because it is prime and its reverse (1285184441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1444815821 - 2²² = 1440621517 is a prime.

It is a super-2 number, since 2×1444815821² = 4174985513223808082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1444815829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722407910 + 722407911.

It is an arithmetic number, because the mean of its divisors is an integer number (722407911).

Almost surely, 2^1444815821 is an apocalyptic number.

It is an amenable number.

1444815821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444815821 is an equidigital number, since it uses as much as digits as its factorization.

1444815821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40960, while the sum is 38.

The square root of 1444815821 is about 38010.7329710965. The cubic root of 1444815821 is about 1130.5006842231.

The spelling of 1444815821 in words is "one billion, four hundred forty-four million, eight hundred fifteen thousand, eight hundred twenty-one".