231304133 has 4 divisors (see below), whose sum is σ = 231360108. Its totient is φ = 231248160.

The previous prime is 231304111. The next prime is 231304189. The reversal of 231304133 is 331403132.

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 164685889 + 66618244 = 12833^2 + 8162^2 .

It is a cyclic number.

It is not a de Polignac number, because 231304133 - 2⁶ = 231304069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231304433) 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, 21248 + ... + 30233.

It is an arithmetic number, because the mean of its divisors is an integer number (57840027).

Almost surely, 2^231304133 is an apocalyptic number.

It is an amenable number.

231304133 is a deficient number, since it is larger than the sum of its proper divisors (55975).

231304133 is an equidigital number, since it uses as much as digits as its factorization.

231304133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55974.

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

The square root of 231304133 is about 15208.6861036712. The cubic root of 231304133 is about 613.8484039369.

Adding to 231304133 its reverse (331403132), we get a palindrome (562707265).

The spelling of 231304133 in words is "two hundred thirty-one million, three hundred four thousand, one hundred thirty-three".