135312123231 has 24 divisors (see below), whose sum is σ = 201782231040. Its totient is φ = 87286669200.

The previous prime is 135312123223. The next prime is 135312123251. The reversal of 135312123231 is 132321213531.

135312123231 is a `hidden beast` number, since 1 + 3 + 531 + 2 + 123 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 135312123231 - 2³ = 135312123223 is a prime.

It is a super-2 number, since 2×135312123231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135312123195 and 135312123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135312123211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2436390 + ... + 2491308.

It is an arithmetic number, because the mean of its divisors is an integer number (8407592960).

Almost surely, 2^135312123231 is an apocalyptic number.

135312123231 is a deficient number, since it is larger than the sum of its proper divisors (66470107809).

135312123231 is a wasteful number, since it uses less digits than its factorization.

135312123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63787 (or 63784 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

Adding to 135312123231 its reverse (132321213531), we get a palindrome (267633336762).

The spelling of 135312123231 in words is "one hundred thirty-five billion, three hundred twelve million, one hundred twenty-three thousand, two hundred thirty-one".