231136133 has 4 divisors (see below), whose sum is σ = 231879648. Its totient is φ = 230392620.

The previous prime is 231136123. The next prime is 231136141. The reversal of 231136133 is 331631132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231136133 - 2⁴ = 231136117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231136099 and 231136108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231136123) 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, 371291 + ... + 371912.

It is an arithmetic number, because the mean of its divisors is an integer number (57969912).

Almost surely, 2^231136133 is an apocalyptic number.

It is an amenable number.

231136133 is a deficient number, since it is larger than the sum of its proper divisors (743515).

231136133 is an equidigital number, since it uses as much as digits as its factorization.

231136133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743514.

The product of its digits is 972, while the sum is 23.

The square root of 231136133 is about 15203.1619408595. The cubic root of 231136133 is about 613.6997518742.

Adding to 231136133 its reverse (331631132), we get a palindrome (562767265).

The spelling of 231136133 in words is "two hundred thirty-one million, one hundred thirty-six thousand, one hundred thirty-three".