133489 has 4 divisors (see below), whose sum is σ = 134640. Its totient is φ = 132340.

The previous prime is 133481. The next prime is 133493. The reversal of 133489 is 984331.

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: 984331 = 23 ⋅42797.

It is a cyclic number.

It is not a de Polignac number, because 133489 - 2³ = 133481 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133481) 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, 379 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (33660).

2¹³³⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

133489 is a deficient number, since it is larger than the sum of its proper divisors (1151).

133489 is a wasteful number, since it uses less digits than its factorization.

133489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its digits is 2592, while the sum is 28.

The square root of 133489 is about 365.3614648536. The cubic root of 133489 is about 51.1071692332.

The spelling of 133489 in words is "one hundred thirty-three thousand, four hundred eighty-nine".