133445 has 8 divisors (see below), whose sum is σ = 172536. Its totient is φ = 98496.

The previous prime is 133439. The next prime is 133447. The reversal of 133445 is 544331.

It can be written as a sum of positive squares in 4 ways, for example, as 2401 + 131044 = 49^2 + 362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133445 - 2¹⁰ = 132421 is a prime.

It is a Curzon number.

It is a plaindrome in base 10 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962 + ... + 1091.

It is an arithmetic number, because the mean of its divisors is an integer number (21567).

2¹³³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

133445 is a deficient number, since it is larger than the sum of its proper divisors (39091).

133445 is a wasteful number, since it uses less digits than its factorization.

133445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071.

The product of its digits is 720, while the sum is 20.

The square root of 133445 is about 365.3012455495. The cubic root of 133445 is about 51.1015533833.

Adding to 133445 its reverse (544331), we get a palindrome (677776).

The spelling of 133445 in words is "one hundred thirty-three thousand, four hundred forty-five".