1225204445 has 8 divisors (see below), whose sum is σ = 1497986136. Its totient is φ = 961669696.

The previous prime is 1225204439. The next prime is 1225204469. The reversal of 1225204445 is 5444025221.

It can be written as a sum of positive squares in 4 ways, for example, as 530196676 + 695007769 = 23026^2 + 26363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225204445 - 2¹⁴ = 1225188061 is a prime.

It is a super-2 number, since 2×1225204445² = 3002251864095516050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2311442 + ... + 2311971.

It is an arithmetic number, because the mean of its divisors is an integer number (187248267).

Almost surely, 2^1225204445 is an apocalyptic number.

It is an amenable number.

1225204445 is a deficient number, since it is larger than the sum of its proper divisors (272781691).

1225204445 is an equidigital number, since it uses as much as digits as its factorization.

1225204445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623471.

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 1225204445 is about 35002.9205210080. The cubic root of 1225204445 is about 1070.0470020405.

Adding to 1225204445 its reverse (5444025221), we get a palindrome (6669229666).

The spelling of 1225204445 in words is "one billion, two hundred twenty-five million, two hundred four thousand, four hundred forty-five".