1444540661 has 4 divisors (see below), whose sum is σ = 1445061024. Its totient is φ = 1444020300.

The previous prime is 1444540651. The next prime is 1444540679. The reversal of 1444540661 is 1660454441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1660454441 = 19 ⋅87392339.

It is a cyclic number.

It is not a de Polignac number, because 1444540661 - 2⁶ = 1444540597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444540651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255995 + ... + 261576.

It is an arithmetic number, because the mean of its divisors is an integer number (361265256).

Almost surely, 2^1444540661 is an apocalyptic number.

It is an amenable number.

1444540661 is a deficient number, since it is larger than the sum of its proper divisors (520363).

1444540661 is an equidigital number, since it uses as much as digits as its factorization.

1444540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520362.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 1444540661 is about 38007.1132947505. The cubic root of 1444540661 is about 1130.4289130642.

The spelling of 1444540661 in words is "one billion, four hundred forty-four million, five hundred forty thousand, six hundred sixty-one".