133523441 has 4 divisors (see below), whose sum is σ = 139328832. Its totient is φ = 127718052.

The previous prime is 133523419. The next prime is 133523459. The reversal of 133523441 is 144325331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133523441 - 2²⁶ = 66414577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133523441.

It is not an unprimeable number, because it can be changed into a prime (133523641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902661 + ... + 2902706.

It is an arithmetic number, because the mean of its divisors is an integer number (34832208).

Almost surely, 2^133523441 is an apocalyptic number.

It is an amenable number.

133523441 is a deficient number, since it is larger than the sum of its proper divisors (5805391).

133523441 is an equidigital number, since it uses as much as digits as its factorization.

133523441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805390.

The product of its digits is 4320, while the sum is 26.

The square root of 133523441 is about 11555.2343550445. The cubic root of 133523441 is about 511.1156417875.

Adding to 133523441 its reverse (144325331), we get a palindrome (277848772).

The spelling of 133523441 in words is "one hundred thirty-three million, five hundred twenty-three thousand, four hundred forty-one".