1318688415491 has 2 divisors, whose sum is σ = 1318688415492. Its totient is φ = 1318688415490.

The previous prime is 1318688415427. The next prime is 1318688415503. The reversal of 1318688415491 is 1945148868131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1318688415491 - 2⁶ = 1318688415427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1318688415491.

It is not a weakly prime, because it can be changed into another prime (1318688417491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659344207745 + 659344207746.

It is an arithmetic number, because the mean of its divisors is an integer number (659344207746).

Almost surely, 2^{1318688415491} is an apocalyptic number.

1318688415491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318688415491 is an equidigital number, since it uses as much as digits as its factorization.

1318688415491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 59.

The spelling of 1318688415491 in words is "one trillion, three hundred eighteen billion, six hundred eighty-eight million, four hundred fifteen thousand, four hundred ninety-one".