123135255231 has 4 divisors (see below), whose sum is σ = 164180340312. Its totient is φ = 82090170152.

The previous prime is 123135255223. The next prime is 123135255263. The reversal of 123135255231 is 132552531321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123135255231 - 2³ = 123135255223 is a prime.

It is a super-2 number, since 2×123135255231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123135255192 and 123135255201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123135255211) 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, 20522542536 + ... + 20522542541.

It is an arithmetic number, because the mean of its divisors is an integer number (41045085078).

Almost surely, 2^123135255231 is an apocalyptic number.

123135255231 is a deficient number, since it is larger than the sum of its proper divisors (41045085081).

123135255231 is an equidigital number, since it uses as much as digits as its factorization.

123135255231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41045085080.

The product of its digits is 27000, while the sum is 33.

Adding to 123135255231 its reverse (132552531321), we get a palindrome (255687786552).

The spelling of 123135255231 in words is "one hundred twenty-three billion, one hundred thirty-five million, two hundred fifty-five thousand, two hundred thirty-one".