12866831 has 2 divisors, whose sum is σ = 12866832. Its totient is φ = 12866830.

The previous prime is 12866827. The next prime is 12866851. The reversal of 12866831 is 13866821.

It is a weak prime.

It is an emirp because it is prime and its reverse (13866821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12866831 - 2² = 12866827 is a prime.

It is a super-2 number, since 2×12866831² = 331110679965122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 12866791 and 12866800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12866801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6433415 + 6433416.

It is an arithmetic number, because the mean of its divisors is an integer number (6433416).

Almost surely, 2^12866831 is an apocalyptic number.

12866831 is a deficient number, since it is larger than the sum of its proper divisors (1).

12866831 is an equidigital number, since it uses as much as digits as its factorization.

12866831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 12866831 is about 3587.0365205835. The cubic root of 12866831 is about 234.3278272113.

The spelling of 12866831 in words is "twelve million, eight hundred sixty-six thousand, eight hundred thirty-one".