133235231 has 2 divisors, whose sum is σ = 133235232. Its totient is φ = 133235230.

The previous prime is 133235189. The next prime is 133235233. The reversal of 133235231 is 132532331.

It is a strong prime.

It is an emirp because it is prime and its reverse (132532331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133235231 is a prime.

It is a super-2 number, since 2×133235231² = 35503253559246722, which contains 22 as substring.

Together with 133235233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133235197 and 133235206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133235233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66617615 + 66617616.

It is an arithmetic number, because the mean of its divisors is an integer number (66617616).

Almost surely, 2^133235231 is an apocalyptic number.

133235231 is a deficient number, since it is larger than the sum of its proper divisors (1).

133235231 is an equidigital number, since it uses as much as digits as its factorization.

133235231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 23.

The square root of 133235231 is about 11542.7566464861. The cubic root of 133235231 is about 510.7476296150.

Adding to 133235231 its reverse (132532331), we get a palindrome (265767562).

It can be divided in two parts, 1332 and 35231, that added together give a palindrome (36563).

The spelling of 133235231 in words is "one hundred thirty-three million, two hundred thirty-five thousand, two hundred thirty-one".