1444715561 has 4 divisors (see below), whose sum is σ = 1453066692. Its totient is φ = 1436364432.

The previous prime is 1444715507. The next prime is 1444715567. The reversal of 1444715561 is 1655174441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1655174441 = 479 ⋅3455479.

It can be written as a sum of positive squares in 2 ways, for example, as 708624400 + 736091161 = 26620^2 + 27131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444715561 - 2²⁶ = 1377606697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1444715567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4175306 + ... + 4175651.

It is an arithmetic number, because the mean of its divisors is an integer number (363266673).

Almost surely, 2^1444715561 is an apocalyptic number.

It is an amenable number.

1444715561 is a deficient number, since it is larger than the sum of its proper divisors (8351131).

1444715561 is an equidigital number, since it uses as much as digits as its factorization.

1444715561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351130.

The product of its digits is 67200, while the sum is 38.

The square root of 1444715561 is about 38009.4141101912. The cubic root of 1444715561 is about 1130.4745340341.

The spelling of 1444715561 in words is "one billion, four hundred forty-four million, seven hundred fifteen thousand, five hundred sixty-one".