1311547691 has 2 divisors, whose sum is σ = 1311547692. Its totient is φ = 1311547690.

The previous prime is 1311547681. The next prime is 1311547753. The reversal of 1311547691 is 1967451131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1967451131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311547691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311547681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655773845 + 655773846.

It is an arithmetic number, because the mean of its divisors is an integer number (655773846).

Almost surely, 2^1311547691 is an apocalyptic number.

1311547691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311547691 is an equidigital number, since it uses as much as digits as its factorization.

1311547691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 1311547691 is about 36215.2963676952. The cubic root of 1311547691 is about 1094.6149173784.

It can be divided in two parts, 13115 and 47691, that added together give a palindrome (60806).

The spelling of 1311547691 in words is "one billion, three hundred eleven million, five hundred forty-seven thousand, six hundred ninety-one".