1445220553 has 8 divisors (see below), whose sum is σ = 1685388800. Its totient is φ = 1238760180.

The previous prime is 1445220529. The next prime is 1445220559. The reversal of 1445220553 is 3550225441.

It is a de Polignac number, because none of the positive numbers 2^k-1445220553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1445220559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2106393 + ... + 2107078.

It is an arithmetic number, because the mean of its divisors is an integer number (210673600).

Almost surely, 2^1445220553 is an apocalyptic number.

It is an amenable number.

1445220553 is a deficient number, since it is larger than the sum of its proper divisors (240168247).

1445220553 is an frugal number, since it uses more digits than its factorization.

1445220553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213492 (or 4213478 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 1445220553 is about 38016.0565156356. The cubic root of 1445220553 is about 1130.6062356433.

Adding to 1445220553 its reverse (3550225441), we get a palindrome (4995445994).

The spelling of 1445220553 in words is "one billion, four hundred forty-five million, two hundred twenty thousand, five hundred fifty-three".