1445644561 has 4 divisors (see below), whose sum is σ = 1466005824. Its totient is φ = 1425283300.

The previous prime is 1445644559. The next prime is 1445644591. The reversal of 1445644561 is 1654465441.

It is a happy number.

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: 1654465441 = 337 ⋅4909393.

It is a cyclic number.

It is not a de Polignac number, because 1445644561 - 2¹ = 1445644559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1445644531) 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 3 ways as a sum of consecutive naturals, for example, 10180525 + ... + 10180666.

It is an arithmetic number, because the mean of its divisors is an integer number (366501456).

Almost surely, 2^1445644561 is an apocalyptic number.

It is an amenable number.

1445644561 is a deficient number, since it is larger than the sum of its proper divisors (20361263).

1445644561 is an equidigital number, since it uses as much as digits as its factorization.

1445644561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20361262.

The product of its digits is 230400, while the sum is 40.

The square root of 1445644561 is about 38021.6328029189. The cubic root of 1445644561 is about 1130.7167929820.

The spelling of 1445644561 in words is "one billion, four hundred forty-five million, six hundred forty-four thousand, five hundred sixty-one".