231655133 has 4 divisors (see below), whose sum is σ = 231688668. Its totient is φ = 231621600.

The previous prime is 231655117. The next prime is 231655189. The reversal of 231655133 is 331556132.

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 188595289 + 43059844 = 13733^2 + 6562^2 .

It is a cyclic number.

It is not a de Polignac number, because 231655133 - 2⁴ = 231655117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231655096 and 231655105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231615133) 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, 2168 + ... + 21633.

It is an arithmetic number, because the mean of its divisors is an integer number (57922167).

Almost surely, 2^231655133 is an apocalyptic number.

It is an amenable number.

231655133 is a deficient number, since it is larger than the sum of its proper divisors (33535).

231655133 is an equidigital number, since it uses as much as digits as its factorization.

231655133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33534.

The product of its digits is 8100, while the sum is 29.

The square root of 231655133 is about 15220.2211876175. The cubic root of 231655133 is about 614.1587484356.

Subtracting 231655133 from its reverse (331556132), we obtain a palindrome (99900999).

The spelling of 231655133 in words is "two hundred thirty-one million, six hundred fifty-five thousand, one hundred thirty-three".