12621647 has 2 divisors, whose sum is σ = 12621648. Its totient is φ = 12621646.

The previous prime is 12621611. The next prime is 12621649. The reversal of 12621647 is 74612621.

12621647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12621647 - 2⁸ = 12621391 is a prime.

Together with 12621649, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₂₆₁₃₉ and since 12621647 and 826139 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12621649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310823 + 6310824.

It is an arithmetic number, because the mean of its divisors is an integer number (6310824).

Almost surely, 2^12621647 is an apocalyptic number.

12621647 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621647 is an equidigital number, since it uses as much as digits as its factorization.

12621647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 12621647 is about 3552.6957370425. The cubic root of 12621647 is about 232.8298597658.

The spelling of 12621647 in words is "twelve million, six hundred twenty-one thousand, six hundred forty-seven".