12643117 has 2 divisors, whose sum is σ = 12643118. Its totient is φ = 12643116.

The previous prime is 12643109. The next prime is 12643177. The reversal of 12643117 is 71134621.

12643117 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 1713481 = 3306^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643117 - 2³ = 12643109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12643091 and 12643100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12643177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321558 + 6321559.

It is an arithmetic number, because the mean of its divisors is an integer number (6321559).

Almost surely, 2^12643117 is an apocalyptic number.

It is an amenable number.

12643117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643117 is an equidigital number, since it uses as much as digits as its factorization.

12643117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 12643117 is about 3555.7161022781. The cubic root of 12643117 is about 232.9618030676.

Adding to 12643117 its reverse (71134621), we get a palindrome (83777738).

The spelling of 12643117 in words is "twelve million, six hundred forty-three thousand, one hundred seventeen".