12865631 has 2 divisors, whose sum is σ = 12865632. Its totient is φ = 12865630.

The previous prime is 12865613. The next prime is 12865663. The reversal of 12865631 is 13656821.

It is a happy number.

Together with previous prime (12865613) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (12865663) can be obtained adding 12865631 to its sum of digits (32).

It is a weak prime.

It is an emirp because it is prime and its reverse (13656821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12865631 is a prime.

It is a super-2 number, since 2×12865631² = 331048922056322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12865681) 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, 6432815 + 6432816.

It is an arithmetic number, because the mean of its divisors is an integer number (6432816).

Almost surely, 2^12865631 is an apocalyptic number.

12865631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12865631 is an equidigital number, since it uses as much as digits as its factorization.

12865631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 12865631 is about 3586.8692476866. The cubic root of 12865631 is about 234.3205422750.

The spelling of 12865631 in words is "twelve million, eight hundred sixty-five thousand, six hundred thirty-one".