133531023 has 8 divisors (see below), whose sum is σ = 179341488. Its totient is φ = 88370624.

The previous prime is 133531019. The next prime is 133531033. The reversal of 133531023 is 320135331.

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

It is a cyclic number.

It is not a de Polignac number, because 133531023 - 2² = 133531019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133531033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162036 + ... + 162857.

It is an arithmetic number, because the mean of its divisors is an integer number (22417686).

Almost surely, 2^133531023 is an apocalyptic number.

133531023 is a deficient number, since it is larger than the sum of its proper divisors (45810465).

133531023 is a wasteful number, since it uses less digits than its factorization.

133531023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325033.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 133531023 is about 11555.5624268142. The cubic root of 133531023 is about 511.1253160076.

Adding to 133531023 its reverse (320135331), we get a palindrome (453666354).

The spelling of 133531023 in words is "one hundred thirty-three million, five hundred thirty-one thousand, twenty-three".