1311827687 has 4 divisors (see below), whose sum is σ = 1319410680. Its totient is φ = 1304244696.

The previous prime is 1311827663. The next prime is 1311827689. The reversal of 1311827687 is 7867281131.

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 1311827687 - 2¹⁸ = 1311565543 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 (1311827689) 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, 3791237 + ... + 3791582.

It is an arithmetic number, because the mean of its divisors is an integer number (329852670).

Almost surely, 2^1311827687 is an apocalyptic number.

1311827687 is a deficient number, since it is larger than the sum of its proper divisors (7582993).

1311827687 is an equidigital number, since it uses as much as digits as its factorization.

1311827687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7582992.

The product of its digits is 112896, while the sum is 44.

The square root of 1311827687 is about 36219.1618760015. The cubic root of 1311827687 is about 1094.6928065249.

The spelling of 1311827687 in words is "one billion, three hundred eleven million, eight hundred twenty-seven thousand, six hundred eighty-seven".