12687331 has 2 divisors, whose sum is σ = 12687332. Its totient is φ = 12687330.

The previous prime is 12687223. The next prime is 12687343. The reversal of 12687331 is 13378621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12687331 - 2¹⁵ = 12654563 is a prime.

It is a super-2 number, since 2×12687331² = 321936735807122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12687293 and 12687302.

It is not a weakly prime, because it can be changed into another prime (12627331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6343665 + 6343666.

It is an arithmetic number, because the mean of its divisors is an integer number (6343666).

Almost surely, 2^12687331 is an apocalyptic number.

12687331 is a deficient number, since it is larger than the sum of its proper divisors (1).

12687331 is an equidigital number, since it uses as much as digits as its factorization.

12687331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 12687331 is about 3561.9279891654. The cubic root of 12687331 is about 233.2330491954.

The spelling of 12687331 in words is "twelve million, six hundred eighty-seven thousand, three hundred thirty-one".