1311513215447 has 2 divisors, whose sum is σ = 1311513215448. Its totient is φ = 1311513215446.

The previous prime is 1311513215443. The next prime is 1311513215459. The reversal of 1311513215447 is 7445123151131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311513215447 - 2² = 1311513215443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311513215447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311513215443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655756607723 + 655756607724.

It is an arithmetic number, because the mean of its divisors is an integer number (655756607724).

Almost surely, 2^{1311513215447} is an apocalyptic number.

1311513215447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311513215447 is an equidigital number, since it uses as much as digits as its factorization.

1311513215447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

Adding to 1311513215447 its reverse (7445123151131), we get a palindrome (8756636366578).

The spelling of 1311513215447 in words is "one trillion, three hundred eleven billion, five hundred thirteen million, two hundred fifteen thousand, four hundred forty-seven".