133573 has 4 divisors (see below), whose sum is σ = 145728. Its totient is φ = 121420.

The previous prime is 133571. The next prime is 133583. The reversal of 133573 is 375331.

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 133573 - 2¹ = 133571 is a prime.

133573 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6061 + ... + 6082.

It is an arithmetic number, because the mean of its divisors is an integer number (36432).

2¹³³⁵⁷³ is an apocalyptic number.

It is an amenable number.

133573 is a deficient number, since it is larger than the sum of its proper divisors (12155).

133573 is a wasteful number, since it uses less digits than its factorization.

133573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12154.

The product of its digits is 945, while the sum is 22.

The square root of 133573 is about 365.4764014270. The cubic root of 133573 is about 51.1178869754.

The spelling of 133573 in words is "one hundred thirty-three thousand, five hundred seventy-three".