1220603503 has 4 divisors (see below), whose sum is σ = 1394975440. Its totient is φ = 1046231568.

The previous prime is 1220603411. The next prime is 1220603509. The reversal of 1220603503 is 3053060221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220603503 - 2⁹ = 1220602991 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 (1220603509) 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, 87185958 + ... + 87185971.

It is an arithmetic number, because the mean of its divisors is an integer number (348743860).

Almost surely, 2^1220603503 is an apocalyptic number.

1220603503 is a deficient number, since it is larger than the sum of its proper divisors (174371937).

1220603503 is an equidigital number, since it uses as much as digits as its factorization.

1220603503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174371936.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1220603503 is about 34937.1364453356. The cubic root of 1220603503 is about 1068.7058926065.

Adding to 1220603503 its reverse (3053060221), we get a palindrome (4273663724).

The spelling of 1220603503 in words is "one billion, two hundred twenty million, six hundred three thousand, five hundred three".