1225611003 has 4 divisors (see below), whose sum is σ = 1634148008. Its totient is φ = 817074000.

The previous prime is 1225611001. The next prime is 1225611007. The reversal of 1225611003 is 3001165221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3001165221 = 3 ⋅1000388407.

It is not a de Polignac number, because 1225611003 - 2¹ = 1225611001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225611001) 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, 204268498 + ... + 204268503.

It is an arithmetic number, because the mean of its divisors is an integer number (408537002).

Almost surely, 2^1225611003 is an apocalyptic number.

1225611003 is a deficient number, since it is larger than the sum of its proper divisors (408537005).

1225611003 is an equidigital number, since it uses as much as digits as its factorization.

1225611003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408537004.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1225611003 is about 35008.7275261470. The cubic root of 1225611003 is about 1070.1653463871.

Adding to 1225611003 its reverse (3001165221), we get a palindrome (4226776224).

The spelling of 1225611003 in words is "one billion, two hundred twenty-five million, six hundred eleven thousand, three".