1224440545 has 4 divisors (see below), whose sum is σ = 1469328660. Its totient is φ = 979552432.

The previous prime is 1224440537. The next prime is 1224440549. The reversal of 1224440545 is 5450444221.

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 232379536 + 992061009 = 15244^2 + 31497^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224440545 - 2³ = 1224440537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1224440549) 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, 122444050 + ... + 122444059.

It is an arithmetic number, because the mean of its divisors is an integer number (367332165).

Almost surely, 2^1224440545 is an apocalyptic number.

It is an amenable number.

1224440545 is a deficient number, since it is larger than the sum of its proper divisors (244888115).

1224440545 is an equidigital number, since it uses as much as digits as its factorization.

1224440545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244888114.

The product of its (nonzero) digits is 25600, while the sum is 31.

The square root of 1224440545 is about 34992.0068729989. The cubic root of 1224440545 is about 1069.8245687292.

Adding to 1224440545 its reverse (5450444221), we get a palindrome (6674884766).

The spelling of 1224440545 in words is "one billion, two hundred twenty-four million, four hundred forty thousand, five hundred forty-five".