1265163103 has 24 divisors (see below), whose sum is σ = 1395008000. Its totient is φ = 1145957760.

The previous prime is 1265163083. The next prime is 1265163149. The reversal of 1265163103 is 3013615621.

It is not a de Polignac number, because 1265163103 - 2¹⁷ = 1265032031 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 (1265163703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2535148 + ... + 2535646.

Almost surely, 2^1265163103 is an apocalyptic number.

1265163103 is a deficient number, since it is larger than the sum of its proper divisors (129844897).

1265163103 is a wasteful number, since it uses less digits than its factorization.

1265163103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1265163103 is about 35569.1313219764. The cubic root of 1265163103 is about 1081.5555724353. Note that the first 4 decimals are identical.

Adding to 1265163103 its reverse (3013615621), we get a palindrome (4278778724).

The spelling of 1265163103 in words is "one billion, two hundred sixty-five million, one hundred sixty-three thousand, one hundred three".