133289 has 4 divisors (see below), whose sum is σ = 143556. Its totient is φ = 123024.

The previous prime is 133283. The next prime is 133303. The reversal of 133289 is 982331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982331 = 7 ⋅140333.

It can be written as a sum of positive squares in 2 ways, for example, as 17689 + 115600 = 133^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 133289 - 2⁸ = 133033 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 (133283) 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, 5114 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (35889).

2¹³³²⁸⁹ is an apocalyptic number.

It is an amenable number.

133289 is a deficient number, since it is larger than the sum of its proper divisors (10267).

133289 is a wasteful number, since it uses less digits than its factorization.

133289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10266.

The product of its digits is 1296, while the sum is 26.

The square root of 133289 is about 365.0876607063. The cubic root of 133289 is about 51.0816326900.

The spelling of 133289 in words is "one hundred thirty-three thousand, two hundred eighty-nine".