1444445581 has 2 divisors, whose sum is σ = 1444445582. Its totient is φ = 1444445580.

The previous prime is 1444445557. The next prime is 1444445593. The reversal of 1444445581 is 1855444441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854392900 + 590052681 = 29230^2 + 24291^2 .

It is an emirp because it is prime and its reverse (1855444441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1444445581 - 2²¹ = 1442348429 is a prime.

It is a super-2 number, since 2×1444445581² = 4172846072940855122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1444445381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722222790 + 722222791.

It is an arithmetic number, because the mean of its divisors is an integer number (722222791).

Almost surely, 2^1444445581 is an apocalyptic number.

It is an amenable number.

1444445581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444445581 is an equidigital number, since it uses as much as digits as its factorization.

1444445581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204800, while the sum is 40.

The square root of 1444445581 is about 38005.8624556791. The cubic root of 1444445581 is about 1130.4041108226.

It can be divided in two parts, 14444 and 45581, that added together give a square (60025 = 245²).

The spelling of 1444445581 in words is "one billion, four hundred forty-four million, four hundred forty-five thousand, five hundred eighty-one".