123641647 has 2 divisors, whose sum is σ = 123641648. Its totient is φ = 123641646.

The previous prime is 123641627. The next prime is 123641657. The reversal of 123641647 is 746146321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123641647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123641627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61820823 + 61820824.

It is an arithmetic number, because the mean of its divisors is an integer number (61820824).

Almost surely, 2^123641647 is an apocalyptic number.

123641647 is a deficient number, since it is larger than the sum of its proper divisors (1).

123641647 is an equidigital number, since it uses as much as digits as its factorization.

123641647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 123641647 is about 11119.4265589553. The cubic root of 123641647 is about 498.1822623344.

Adding to 123641647 its reverse (746146321), we get a palindrome (869787968).

The spelling of 123641647 in words is "one hundred twenty-three million, six hundred forty-one thousand, six hundred forty-seven".