231232133 has 16 divisors (see below), whose sum is σ = 263786112. Its totient is φ = 200640000.

The previous prime is 231232123. The next prime is 231232153. The reversal of 231232133 is 331232132.

It is not a de Polignac number, because 231232133 - 2⁴ = 231232117 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 (231232123) 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, 191933 + ... + 193133.

It is an arithmetic number, because the mean of its divisors is an integer number (16486632).

Almost surely, 2^231232133 is an apocalyptic number.

231232133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231232133 is a deficient number, since it is larger than the sum of its proper divisors (32553979).

231232133 is a wasteful number, since it uses less digits than its factorization.

231232133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996.

The product of its digits is 648, while the sum is 20.

The square root of 231232133 is about 15206.3188510566. The cubic root of 231232133 is about 613.7847047267.

Adding to 231232133 its reverse (331232132), we get a palindrome (562464265).

Subtracting 231232133 from its reverse (331232132), we obtain a palindrome (99999999).

The spelling of 231232133 in words is "two hundred thirty-one million, two hundred thirty-two thousand, one hundred thirty-three".