12646981 has 2 divisors, whose sum is σ = 12646982. Its totient is φ = 12646980.

The previous prime is 12646979. The next prime is 12647003. The reversal of 12646981 is 18964621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 5597956 = 2655^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646981 - 2¹ = 12646979 is a prime.

It is a super-2 number, since 2×12646981² = 319892256828722, which contains 22 as substring.

Together with 12646979, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12646981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12646961) 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, 6323490 + 6323491.

It is an arithmetic number, because the mean of its divisors is an integer number (6323491).

Almost surely, 2^12646981 is an apocalyptic number.

It is an amenable number.

12646981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646981 is an equidigital number, since it uses as much as digits as its factorization.

12646981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 12646981 is about 3556.2594112354. The cubic root of 12646981 is about 232.9855333107.

The spelling of 12646981 in words is "twelve million, six hundred forty-six thousand, nine hundred eighty-one".