1263135128 has 16 divisors (see below), whose sum is σ = 2371135680. Its totient is φ = 630832288.

The previous prime is 1263135089. The next prime is 1263135151. The reversal of 1263135128 is 8215313621.

It is a junction number, because it is equal to n+sod(n) for n = 1263135094 and 1263135103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84575 + ... + 98382.

It is an arithmetic number, because the mean of its divisors is an integer number (148195980).

Almost surely, 2^1263135128 is an apocalyptic number.

It is an amenable number.

1263135128 is a deficient number, since it is larger than the sum of its proper divisors (1108000552).

1263135128 is a wasteful number, since it uses less digits than its factorization.

1263135128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183826 (or 183822 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 1263135128 is about 35540.6123751406. The cubic root of 1263135128 is about 1080.9773754045.

Adding to 1263135128 its reverse (8215313621), we get a palindrome (9478448749).

The spelling of 1263135128 in words is "one billion, two hundred sixty-three million, one hundred thirty-five thousand, one hundred twenty-eight".