12641641 has 2 divisors, whose sum is σ = 12641642. Its totient is φ = 12641640.

The previous prime is 12641639. The next prime is 12641663. The reversal of 12641641 is 14614621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 883600 = 3429^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 12641641 - 2¹ = 12641639 is a prime.

It is a super-2 number, since 2×12641641² = 319622174345762, which contains 22 as substring.

Together with 12641639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12641341) 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, 6320820 + 6320821.

It is an arithmetic number, because the mean of its divisors is an integer number (6320821).

Almost surely, 2^12641641 is an apocalyptic number.

It is an amenable number.

12641641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641641 is an equidigital number, since it uses as much as digits as its factorization.

12641641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 12641641 is about 3555.5085430920. The cubic root of 12641641 is about 232.9527371333.

The spelling of 12641641 in words is "twelve million, six hundred forty-one thousand, six hundred forty-one".