231142133 has 16 divisors (see below), whose sum is σ = 241823232. Its totient is φ = 220752000.

The previous prime is 231142123. The next prime is 231142147. The reversal of 231142133 is 331241132.

It is a cyclic number.

It is not a de Polignac number, because 231142133 - 2¹⁴ = 231125749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231142103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 788735 + ... + 789027.

It is an arithmetic number, because the mean of its divisors is an integer number (15113952).

Almost surely, 2^231142133 is an apocalyptic number.

It is an amenable number.

231142133 is a deficient number, since it is larger than the sum of its proper divisors (10681099).

231142133 is a wasteful number, since it uses less digits than its factorization.

231142133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its digits is 432, while the sum is 20.

The square root of 231142133 is about 15203.3592669515. The cubic root of 231142133 is about 613.7050621166.

Adding to 231142133 its reverse (331241132), we get a palindrome (562383265).

It can be divided in two parts, 2311 and 42133, that added together give a palindrome (44444).

The spelling of 231142133 in words is "two hundred thirty-one million, one hundred forty-two thousand, one hundred thirty-three".