1225604447 has 4 divisors (see below), whose sum is σ = 1254106920. Its totient is φ = 1197101976.

The previous prime is 1225604423. The next prime is 1225604453. The reversal of 1225604447 is 7444065221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7444065221 = 107 ⋅69570703.

It is a cyclic number.

It is not a de Polignac number, because 1225604447 - 2²⁸ = 957168991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225600447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14251172 + ... + 14251257.

It is an arithmetic number, because the mean of its divisors is an integer number (313526730).

Almost surely, 2^1225604447 is an apocalyptic number.

1225604447 is a deficient number, since it is larger than the sum of its proper divisors (28502473).

1225604447 is an equidigital number, since it uses as much as digits as its factorization.

1225604447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28502472.

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 1225604447 is about 35008.6338922272. The cubic root of 1225604447 is about 1070.1634382188.

Adding to 1225604447 its reverse (7444065221), we get a palindrome (8669669668).

The spelling of 1225604447 in words is "one billion, two hundred twenty-five million, six hundred four thousand, four hundred forty-seven".