1242113503 has 4 divisors (see below), whose sum is σ = 1242196768. Its totient is φ = 1242030240.

The previous prime is 1242113497. The next prime is 1242113513. The reversal of 1242113503 is 3053112421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3053112421 = 83 ⋅36784487.

It is a cyclic number.

It is not a de Polignac number, because 1242113503 - 2²⁵ = 1208559071 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 (1242113513) 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, 12426 + ... + 51367.

It is an arithmetic number, because the mean of its divisors is an integer number (310549192).

Almost surely, 2^1242113503 is an apocalyptic number.

1242113503 is a deficient number, since it is larger than the sum of its proper divisors (83265).

1242113503 is an equidigital number, since it uses as much as digits as its factorization.

1242113503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83264.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1242113503 is about 35243.6306727897. The cubic root of 1242113503 is about 1074.9471048068.

Adding to 1242113503 its reverse (3053112421), we get a palindrome (4295225924).

The spelling of 1242113503 in words is "one billion, two hundred forty-two million, one hundred thirteen thousand, five hundred three".