231531033 has 16 divisors (see below), whose sum is σ = 321191936. Its totient is φ = 148191120.

The previous prime is 231530989. The next prime is 231531061. The reversal of 231531033 is 330135132.

231531033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231531033 - 2¹² = 231526937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231531733) 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, 2010 + ... + 21612.

It is an arithmetic number, because the mean of its divisors is an integer number (20074496).

Almost surely, 2^231531033 is an apocalyptic number.

It is an amenable number.

231531033 is a deficient number, since it is larger than the sum of its proper divisors (89660903).

231531033 is a wasteful number, since it uses less digits than its factorization.

231531033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19764.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 231531033 is about 15216.1438281846. The cubic root of 231531033 is about 614.0490584928.

Adding to 231531033 its reverse (330135132), we get a palindrome (561666165).

The spelling of 231531033 in words is "two hundred thirty-one million, five hundred thirty-one thousand, thirty-three".