1444444381 has 2 divisors, whose sum is σ = 1444444382. Its totient is φ = 1444444380.

The previous prime is 1444444343. The next prime is 1444444399. The reversal of 1444444381 is 1834444441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1312975225 + 131469156 = 36235^2 + 11466^2 .

It is an emirp because it is prime and its reverse (1834444441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1444444381 - 2¹¹ = 1444442333 is a prime.

It is a super-2 number, since 2×1444444381² = 4172839139604946322, 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 1444444381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1444444081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722222190 + 722222191.

It is an arithmetic number, because the mean of its divisors is an integer number (722222191).

Almost surely, 2^1444444381 is an apocalyptic number.

It is an amenable number.

1444444381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444444381 is an equidigital number, since it uses as much as digits as its factorization.

1444444381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98304, while the sum is 37.

The square root of 1444444381 is about 38005.8466686377. The cubic root of 1444444381 is about 1130.4037977878.

The spelling of 1444444381 in words is "one billion, four hundred forty-four million, four hundred forty-four thousand, three hundred eighty-one".