1444751681 has 8 divisors (see below), whose sum is σ = 1533597480. Its totient is φ = 1356334848.

The previous prime is 1444751663. The next prime is 1444751699. The reversal of 1444751681 is 1861574441.

It is an interprime number because it is at equal distance from previous prime (1444751663) and next prime (1444751699).

It can be written as a sum of positive squares in 4 ways, for example, as 977500225 + 467251456 = 31265^2 + 21616^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1444751681 - 2¹⁴ = 1444735297 is a prime.

It is a super-2 number, since 2×1444751681² = 4174614839504651522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1444751081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100286 + ... + 113783.

It is an arithmetic number, because the mean of its divisors is an integer number (191699685).

Almost surely, 2^1444751681 is an apocalyptic number.

It is an amenable number.

1444751681 is a deficient number, since it is larger than the sum of its proper divisors (88845799).

1444751681 is a wasteful number, since it uses less digits than its factorization.

1444751681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214483.

The product of its digits is 107520, while the sum is 41.

The square root of 1444751681 is about 38009.8892526669. The cubic root of 1444751681 is about 1130.4839551273.

The spelling of 1444751681 in words is "one billion, four hundred forty-four million, seven hundred fifty-one thousand, six hundred eighty-one".