231442533135 has 144 divisors (see below), whose sum is σ = 465630927840. Its totient is φ = 105446522880.

The previous prime is 231442533131. The next prime is 231442533143. The reversal of 231442533135 is 531335244132.

231442533135 is a `hidden beast` number, since 2 + 31 + 442 + 53 + 3 + 135 = 666.

It is not a de Polignac number, because 231442533135 - 2² = 231442533131 is a prime.

It is a super-2 number, since 2×231442533135² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231442533135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231442533131) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 161508379 + ... + 161509811.

It is an arithmetic number, because the mean of its divisors is an integer number (3233548110).

Almost surely, 2^231442533135 is an apocalyptic number.

231442533135 is an abundant number, since it is smaller than the sum of its proper divisors (234188394705).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231442533135 is a wasteful number, since it uses less digits than its factorization.

231442533135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618 (or 2598 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

Adding to 231442533135 its reverse (531335244132), we get a palindrome (762777777267).

The spelling of 231442533135 in words is "two hundred thirty-one billion, four hundred forty-two million, five hundred thirty-three thousand, one hundred thirty-five".