15317513 has 2 divisors, whose sum is σ = 15317514. Its totient is φ = 15317512.

The previous prime is 15317509. The next prime is 15317531. The reversal of 15317513 is 31571351.

15317513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (15317531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 976144 = 3787^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 15317513 - 2² = 15317509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15317213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7658756 + 7658757.

It is an arithmetic number, because the mean of its divisors is an integer number (7658757).

Almost surely, 2^15317513 is an apocalyptic number.

It is an amenable number.

15317513 is a deficient number, since it is larger than the sum of its proper divisors (1).

15317513 is an equidigital number, since it uses as much as digits as its factorization.

15317513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1575, while the sum is 26.

The square root of 15317513 is about 3913.7594458525. The cubic root of 15317513 is about 248.3491926671.

Adding to 15317513 its reverse (31571351), we get a palindrome (46888864).

The spelling of 15317513 in words is "fifteen million, three hundred seventeen thousand, five hundred thirteen".