12315131 has 2 divisors, whose sum is σ = 12315132. Its totient is φ = 12315130.

The previous prime is 12315113. The next prime is 12315161. The reversal of 12315131 is 13151321.

Together with previous prime (12315113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12315131 - 2¹⁴ = 12298747 is a prime.

It is a super-2 number, since 2×12315131² = 303324903094322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12315101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6157565 + 6157566.

It is an arithmetic number, because the mean of its divisors is an integer number (6157566).

Almost surely, 2^12315131 is an apocalyptic number.

12315131 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315131 is an equidigital number, since it uses as much as digits as its factorization.

12315131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90, while the sum is 17.

The square root of 12315131 is about 3509.2920938560. The cubic root of 12315131 is about 230.9296400595.

Adding to 12315131 its reverse (13151321), we get a palindrome (25466452).

It can be divided in two parts, 1 and 2315131, that added together give a palindrome (2315132).

The spelling of 12315131 in words is "twelve million, three hundred fifteen thousand, one hundred thirty-one".