133541533 has 4 divisors (see below), whose sum is σ = 133678368. Its totient is φ = 133404700.

The previous prime is 133541509. The next prime is 133541539. The reversal of 133541533 is 335145331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 335145331 = 439 ⋅763429.

It is a cyclic number.

It is not a de Polignac number, because 133541533 - 2²¹ = 131444381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133541539) 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, 66943 + ... + 68908.

It is an arithmetic number, because the mean of its divisors is an integer number (33419592).

Almost surely, 2^133541533 is an apocalyptic number.

It is an amenable number.

133541533 is a deficient number, since it is larger than the sum of its proper divisors (136835).

133541533 is an equidigital number, since it uses as much as digits as its factorization.

133541533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136834.

The product of its digits is 8100, while the sum is 28.

The square root of 133541533 is about 11556.0171772112. The cubic root of 133541533 is about 511.1387255909.

Adding to 133541533 its reverse (335145331), we get a palindrome (468686864).

The spelling of 133541533 in words is "one hundred thirty-three million, five hundred forty-one thousand, five hundred thirty-three".