133531443 has 8 divisors (see below), whose sum is σ = 197824400. Its totient is φ = 89020944.

The previous prime is 133531439. The next prime is 133531459. The reversal of 133531443 is 344135331.

It is not a de Polignac number, because 133531443 - 2² = 133531439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4945609 = 133531443 / (1 + 3 + 3 + 5 + 3 + 1 + 4 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133531423) 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, 2472778 + ... + 2472831.

It is an arithmetic number, because the mean of its divisors is an integer number (24728050).

Almost surely, 2^133531443 is an apocalyptic number.

133531443 is a deficient number, since it is larger than the sum of its proper divisors (64292957).

133531443 is an equidigital number, since it uses as much as digits as its factorization.

133531443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945618 (or 4945612 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 133531443 is about 11555.5805998660. The cubic root of 133531443 is about 511.1258518941.

Adding to 133531443 its reverse (344135331), we get a palindrome (477666774).

The spelling of 133531443 in words is "one hundred thirty-three million, five hundred thirty-one thousand, four hundred forty-three".