123128512235 has 4 divisors (see below), whose sum is σ = 147754214688. Its totient is φ = 98502809784.

The previous prime is 123128512231. The next prime is 123128512249. The reversal of 123128512235 is 532215821321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 532215821321 = 2551 ⋅208630271.

It is a cyclic number.

It is not a de Polignac number, because 123128512235 - 2² = 123128512231 is a prime.

It is a super-3 number, since 3×123128512235³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123128512195 and 123128512204.

It is not an unprimeable number, because it can be changed into a prime (123128512231) 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, 12312851219 + ... + 12312851228.

It is an arithmetic number, because the mean of its divisors is an integer number (36938553672).

Almost surely, 2^123128512235 is an apocalyptic number.

123128512235 is a deficient number, since it is larger than the sum of its proper divisors (24625702453).

123128512235 is an equidigital number, since it uses as much as digits as its factorization.

123128512235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24625702452.

The product of its digits is 28800, while the sum is 35.

The spelling of 123128512235 in words is "one hundred twenty-three billion, one hundred twenty-eight million, five hundred twelve thousand, two hundred thirty-five".