231001133 has 4 divisors (see below), whose sum is σ = 252001248. Its totient is φ = 210001020.

The previous prime is 231001097. The next prime is 231001139. The reversal of 231001133 is 331100132.

231001133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231001133 - 2⁸ = 231000877 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 (231001139) 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, 10500041 + ... + 10500062.

It is an arithmetic number, because the mean of its divisors is an integer number (63000312).

Almost surely, 2^231001133 is an apocalyptic number.

It is an amenable number.

231001133 is a deficient number, since it is larger than the sum of its proper divisors (21000115).

231001133 is a wasteful number, since it uses less digits than its factorization.

231001133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21000114.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 231001133 is about 15198.7214264885. The cubic root of 231001133 is about 613.5802471179.

Adding to 231001133 its reverse (331100132), we get a palindrome (562101265).

The spelling of 231001133 in words is "two hundred thirty-one million, one thousand, one hundred thirty-three".