1312691263 has 4 divisors (see below), whose sum is σ = 1413667528. Its totient is φ = 1211715000.

The previous prime is 1312691221. The next prime is 1312691279. The reversal of 1312691263 is 3621962131.

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 1312691263 - 2²¹ = 1310594111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312691663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50488113 + ... + 50488138.

It is an arithmetic number, because the mean of its divisors is an integer number (353416882).

Almost surely, 2^1312691263 is an apocalyptic number.

1312691263 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1312691263 is a deficient number, since it is larger than the sum of its proper divisors (100976265).

1312691263 is a wasteful number, since it uses less digits than its factorization.

1312691263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100976264.

The product of its digits is 11664, while the sum is 34.

The square root of 1312691263 is about 36231.0814494958. The cubic root of 1312691263 is about 1094.9329658789.

The spelling of 1312691263 in words is "one billion, three hundred twelve million, six hundred ninety-one thousand, two hundred sixty-three".