123135647 has 2 divisors, whose sum is σ = 123135648. Its totient is φ = 123135646.

The previous prime is 123135619. The next prime is 123135659. The reversal of 123135647 is 746531321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123135647 - 2⁸ = 123135391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123135697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61567823 + 61567824.

It is an arithmetic number, because the mean of its divisors is an integer number (61567824).

Almost surely, 2^123135647 is an apocalyptic number.

123135647 is a deficient number, since it is larger than the sum of its proper divisors (1).

123135647 is an equidigital number, since it uses as much as digits as its factorization.

123135647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 123135647 is about 11096.6502603263. The cubic root of 123135647 is about 497.5017341252.

Adding to 123135647 its reverse (746531321), we get a palindrome (869666968).

The spelling of 123135647 in words is "one hundred twenty-three million, one hundred thirty-five thousand, six hundred forty-seven".