123135027257 has 4 divisors (see below), whose sum is σ = 134329120656. Its totient is φ = 111940933860.

The previous prime is 123135027247. The next prime is 123135027269. The reversal of 123135027257 is 752720531321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123135027257 - 2¹⁸ = 123134765113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123135027257.

It is not an unprimeable number, because it can be changed into a prime (123135027247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5597046683 + ... + 5597046704.

It is an arithmetic number, because the mean of its divisors is an integer number (33582280164).

Almost surely, 2^123135027257 is an apocalyptic number.

It is an amenable number.

123135027257 is a deficient number, since it is larger than the sum of its proper divisors (11194093399).

123135027257 is a wasteful number, since it uses less digits than its factorization.

123135027257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11194093398.

The product of its (nonzero) digits is 88200, while the sum is 38.

Adding to 123135027257 its reverse (752720531321), we get a palindrome (875855558578).

The spelling of 123135027257 in words is "one hundred twenty-three billion, one hundred thirty-five million, twenty-seven thousand, two hundred fifty-seven".