231020033 has 4 divisors (see below), whose sum is σ = 231053268. Its totient is φ = 230986800.

The previous prime is 231019991. The next prime is 231020047. The reversal of 231020033 is 330020132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114746944 + 116273089 = 10712^2 + 10783^2 .

It is a cyclic number.

It is not a de Polignac number, because 231020033 - 2⁸ = 231019777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231020233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766 + ... + 21567.

It is an arithmetic number, because the mean of its divisors is an integer number (57763317).

Almost surely, 2^231020033 is an apocalyptic number.

It is an amenable number.

231020033 is a deficient number, since it is larger than the sum of its proper divisors (33235).

231020033 is an equidigital number, since it uses as much as digits as its factorization.

231020033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33234.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 231020033 is about 15199.3431765981. The cubic root of 231020033 is about 613.5969805862.

Adding to 231020033 its reverse (330020132), we get a palindrome (561040165).

Subtracting 231020033 from its reverse (330020132), we obtain a palindrome (99000099).

The spelling of 231020033 in words is "two hundred thirty-one million, twenty thousand, thirty-three".