1223545445 has 4 divisors (see below), whose sum is σ = 1468254540. Its totient is φ = 978836352.

The previous prime is 1223545423. The next prime is 1223545447. The reversal of 1223545445 is 5445453221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 795634849 + 427910596 = 28207^2 + 20686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223545445 - 2²⁴ = 1206768229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223545447) 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, 122354540 + ... + 122354549.

It is an arithmetic number, because the mean of its divisors is an integer number (367063635).

Almost surely, 2^1223545445 is an apocalyptic number.

It is an amenable number.

1223545445 is a deficient number, since it is larger than the sum of its proper divisors (244709095).

1223545445 is an equidigital number, since it uses as much as digits as its factorization.

1223545445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244709094.

The product of its digits is 96000, while the sum is 35.

The square root of 1223545445 is about 34979.2144708826. The cubic root of 1223545445 is about 1069.5638147017.

Adding to 1223545445 its reverse (5445453221), we get a palindrome (6668998666).

The spelling of 1223545445 in words is "one billion, two hundred twenty-three million, five hundred forty-five thousand, four hundred forty-five".