1242503105 has 16 divisors (see below), whose sum is σ = 1532540304. Its totient is φ = 966355200.

The previous prime is 1242503077. The next prime is 1242503117. The reversal of 1242503105 is 5013052421.

It can be written as a sum of positive squares in 8 ways, for example, as 8456464 + 1234046641 = 2908^2 + 35129^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1242503105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349919 + ... + 353451.

It is an arithmetic number, because the mean of its divisors is an integer number (95783769).

Almost surely, 2^1242503105 is an apocalyptic number.

It is an amenable number.

1242503105 is a deficient number, since it is larger than the sum of its proper divisors (290037199).

1242503105 is a wasteful number, since it uses less digits than its factorization.

1242503105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1242503105 is about 35249.1575076625. The cubic root of 1242503105 is about 1075.0594825568.

Adding to 1242503105 its reverse (5013052421), we get a palindrome (6255555526).

The spelling of 1242503105 in words is "one billion, two hundred forty-two million, five hundred three thousand, one hundred five".