1315123517 has 2 divisors, whose sum is σ = 1315123518. Its totient is φ = 1315123516.

The previous prime is 1315123501. The next prime is 1315123547. The reversal of 1315123517 is 7153215131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276918756 + 38204761 = 35734^2 + 6181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315123517 - 2⁴ = 1315123501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1315123517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315123547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657561758 + 657561759.

It is an arithmetic number, because the mean of its divisors is an integer number (657561759).

Almost surely, 2^1315123517 is an apocalyptic number.

It is an amenable number.

1315123517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315123517 is an equidigital number, since it uses as much as digits as its factorization.

1315123517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 29.

The square root of 1315123517 is about 36264.6317642962. The cubic root of 1315123517 is about 1095.6088069341.

Adding to 1315123517 its reverse (7153215131), we get a palindrome (8468338648).

The spelling of 1315123517 in words is "one billion, three hundred fifteen million, one hundred twenty-three thousand, five hundred seventeen".