1538479316317 has 4 divisors (see below), whose sum is σ = 1555765600860. Its totient is φ = 1521193031776.

The previous prime is 1538479316299. The next prime is 1538479316377. The reversal of 1538479316317 is 7136139748351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 866585980836 + 671893335481 = 930906^2 + 819691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538479316317 - 2⁷ = 1538479316189 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 (1538479316377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8643142138 + ... + 8643142315.

It is an arithmetic number, because the mean of its divisors is an integer number (388941400215).

Almost surely, 2^{1538479316317} is an apocalyptic number.

It is an amenable number.

1538479316317 is a deficient number, since it is larger than the sum of its proper divisors (17286284543).

1538479316317 is an equidigital number, since it uses as much as digits as its factorization.

1538479316317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17286284542.

The product of its digits is 11430720, while the sum is 58.

The spelling of 1538479316317 in words is "one trillion, five hundred thirty-eight billion, four hundred seventy-nine million, three hundred sixteen thousand, three hundred seventeen".