1205103503 has 4 divisors (see below), whose sum is σ = 1205219400. Its totient is φ = 1204987608.

The previous prime is 1205103461. The next prime is 1205103539. The reversal of 1205103503 is 3053015021.

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 1205103503 - 2¹² = 1205099407 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 (1205103203) 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, 40625 + ... + 63722.

It is an arithmetic number, because the mean of its divisors is an integer number (301304850).

Almost surely, 2^1205103503 is an apocalyptic number.

1205103503 is a deficient number, since it is larger than the sum of its proper divisors (115897).

1205103503 is a wasteful number, since it uses less digits than its factorization.

1205103503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115896.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 1205103503 is about 34714.6007178536. The cubic root of 1205103503 is about 1064.1629055856.

Adding to 1205103503 its reverse (3053015021), we get a palindrome (4258118524).

The spelling of 1205103503 in words is "one billion, two hundred five million, one hundred three thousand, five hundred three".