133531233 has 8 divisors (see below), whose sum is σ = 194227296. Its totient is φ = 80928000.

The previous prime is 133531231. The next prime is 133531249. The reversal of 133531233 is 332135331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133531233 - 2¹ = 133531231 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (133531231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023168 + ... + 2023233.

It is an arithmetic number, because the mean of its divisors is an integer number (24278412).

Almost surely, 2^133531233 is an apocalyptic number.

It is an amenable number.

133531233 is a deficient number, since it is larger than the sum of its proper divisors (60696063).

133531233 is a wasteful number, since it uses less digits than its factorization.

133531233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4046415.

The product of its digits is 2430, while the sum is 24.

The square root of 133531233 is about 11555.5715133437. The cubic root of 133531233 is about 511.1255839510.

Adding to 133531233 its reverse (332135331), we get a palindrome (465666564).

The spelling of 133531233 in words is "one hundred thirty-three million, five hundred thirty-one thousand, two hundred thirty-three".