12317531 has 2 divisors, whose sum is σ = 12317532. Its totient is φ = 12317530.

The previous prime is 12317497. The next prime is 12317563. The reversal of 12317531 is 13571321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12317531 - 2⁶ = 12317467 is a prime.

It is a super-2 number, since 2×12317531² = 303443139871922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12317497 and 12317506.

It is not a weakly prime, because it can be changed into another prime (12317831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6158765 + 6158766.

It is an arithmetic number, because the mean of its divisors is an integer number (6158766).

Almost surely, 2^12317531 is an apocalyptic number.

12317531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12317531 is an equidigital number, since it uses as much as digits as its factorization.

12317531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 23.

The square root of 12317531 is about 3509.6340265048. The cubic root of 12317531 is about 230.9446404449.

Adding to 12317531 its reverse (13571321), we get a palindrome (25888852).

The spelling of 12317531 in words is "twelve million, three hundred seventeen thousand, five hundred thirty-one".