1263131264 has 32 divisors (see below), whose sum is σ = 2550884340. Its totient is φ = 622909440.

The previous prime is 1263131257. The next prime is 1263131281. The reversal of 1263131264 is 4621313621.

It can be written as a sum of positive squares in 2 ways, for example, as 1129497664 + 133633600 = 33608^2 + 11560^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58247 + ... + 76934.

Almost surely, 2^1263131264 is an apocalyptic number.

It is an amenable number.

1263131264 is an abundant number, since it is smaller than the sum of its proper divisors (1287753076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263131264 is an equidigital number, since it uses as much as digits as its factorization.

1263131264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135268 (or 135256 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 1263131264 is about 35540.5580147527. The cubic root of 1263131264 is about 1080.9762731469.

Adding to 1263131264 its reverse (4621313621), we get a palindrome (5884444885).

The spelling of 1263131264 in words is "one billion, two hundred sixty-three million, one hundred thirty-one thousand, two hundred sixty-four".