1445453521 has 4 divisors (see below), whose sum is σ = 1459765044. Its totient is φ = 1431142000.

The previous prime is 1445453501. The next prime is 1445453533. The reversal of 1445453521 is 1253545441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1253545441 = 101 ⋅12411341.

It can be written as a sum of positive squares in 2 ways, for example, as 1200969025 + 244484496 = 34655^2 + 15636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445453521 - 2⁷ = 1445453393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1445453501) 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, 7155610 + ... + 7155811.

It is an arithmetic number, because the mean of its divisors is an integer number (364941261).

Almost surely, 2^1445453521 is an apocalyptic number.

It is an amenable number.

1445453521 is a deficient number, since it is larger than the sum of its proper divisors (14311523).

1445453521 is a wasteful number, since it uses less digits than its factorization.

1445453521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14311522.

The product of its digits is 48000, while the sum is 34.

The square root of 1445453521 is about 38019.1204658919. The cubic root of 1445453521 is about 1130.6669832160. Note that the first 3 decimals are identical.

Adding to 1445453521 its reverse (1253545441), we get a palindrome (2698998962).

The spelling of 1445453521 in words is "one billion, four hundred forty-five million, four hundred fifty-three thousand, five hundred twenty-one".