1312688263 has 4 divisors (see below), whose sum is σ = 1330670368. Its totient is φ = 1294706160.

The previous prime is 1312688261. The next prime is 1312688287. The reversal of 1312688263 is 3628862131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312688263 - 2¹ = 1312688261 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 (1312688261) 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, 8990943 + ... + 8991088.

It is an arithmetic number, because the mean of its divisors is an integer number (332667592).

Almost surely, 2^1312688263 is an apocalyptic number.

1312688263 is a deficient number, since it is larger than the sum of its proper divisors (17982105).

1312688263 is an equidigital number, since it uses as much as digits as its factorization.

1312688263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17982104.

The product of its digits is 82944, while the sum is 40.

The square root of 1312688263 is about 36231.0400485551. The cubic root of 1312688263 is about 1094.9321317652.

The spelling of 1312688263 in words is "one billion, three hundred twelve million, six hundred eighty-eight thousand, two hundred sixty-three".