233131231 has 4 divisors (see below), whose sum is σ = 233199472. Its totient is φ = 233062992.

The previous prime is 233131193. The next prime is 233131237. The reversal of 233131231 is 132131332.

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

It is a cyclic number.

It is not a de Polignac number, because 233131231 - 2⁷ = 233131103 is a prime.

It is a super-2 number, since 2×233131231² = 108700341735150722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 233131199 and 233131208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233131237) 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, 28710 + ... + 35923.

It is an arithmetic number, because the mean of its divisors is an integer number (58299868).

Almost surely, 2^233131231 is an apocalyptic number.

233131231 is a deficient number, since it is larger than the sum of its proper divisors (68241).

233131231 is an equidigital number, since it uses as much as digits as its factorization.

233131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68240.

The product of its digits is 324, while the sum is 19.

The square root of 233131231 is about 15268.6355317035. The cubic root of 233131231 is about 615.4604531965.

Adding to 233131231 its reverse (132131332), we get a palindrome (365262563).

The spelling of 233131231 in words is "two hundred thirty-three million, one hundred thirty-one thousand, two hundred thirty-one".