133549 has 4 divisors (see below), whose sum is σ = 143836. Its totient is φ = 123264.

The previous prime is 133543. The next prime is 133559. The reversal of 133549 is 945331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24649 + 108900 = 157^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 133549 - 2³ = 133541 is a prime.

It is a Duffinian number.

133549 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124 + ... + 5149.

It is an arithmetic number, because the mean of its divisors is an integer number (35959).

2¹³³⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

133549 is a deficient number, since it is larger than the sum of its proper divisors (10287).

133549 is a wasteful number, since it uses less digits than its factorization.

133549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10286.

The product of its digits is 1620, while the sum is 25.

The square root of 133549 is about 365.4435660947. The cubic root of 133549 is about 51.1148252219.

The spelling of 133549 in words is "one hundred thirty-three thousand, five hundred forty-nine".