133231 has 6 divisors (see below), whose sum is σ = 155040. Its totient is φ = 114156.

The previous prime is 133213. The next prime is 133241. The reversal of 133231 is 132331.

It is not a de Polignac number, because 133231 - 2⁷ = 133103 is a prime.

It is a super-2 number, since 2×133231² = 35500998722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1311 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (25840).

2¹³³²³¹ is an apocalyptic number.

133231 is a deficient number, since it is larger than the sum of its proper divisors (21809).

133231 is an equidigital number, since it uses as much as digits as its factorization.

133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733 (or 2726 counting only the distinct ones).

The product of its digits is 54, while the sum is 13.

The square root of 133231 is about 365.0082190855. The cubic root of 133231 is about 51.0742223147.

Adding to 133231 its reverse (132331), we get a palindrome (265562).

Subtracting from 133231 its reverse (132331), we obtain a square (900 = 30²).

The spelling of 133231 in words is "one hundred thirty-three thousand, two hundred thirty-one".