1315121317 has 2 divisors, whose sum is σ = 1315121318. Its totient is φ = 1315121316.

The previous prime is 1315121299. The next prime is 1315121321. The reversal of 1315121317 is 7131215131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1076758596 + 238362721 = 32814^2 + 15439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315121317 - 2⁷ = 1315121189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1315121291 and 1315121300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315122317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657560658 + 657560659.

It is an arithmetic number, because the mean of its divisors is an integer number (657560659).

Almost surely, 2^1315121317 is an apocalyptic number.

It is an amenable number.

1315121317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315121317 is an equidigital number, since it uses as much as digits as its factorization.

1315121317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 25.

The square root of 1315121317 is about 36264.6014316992. The cubic root of 1315121317 is about 1095.6081960053.

Adding to 1315121317 its reverse (7131215131), we get a palindrome (8446336448).

The spelling of 1315121317 in words is "one billion, three hundred fifteen million, one hundred twenty-one thousand, three hundred seventeen".