133656 has 16 divisors (see below), whose sum is σ = 334200. Its totient is φ = 44544.

The previous prime is 133649. The next prime is 133657. The reversal of 133656 is 656331.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 5569 = 133656 / (1 + 3 + 3 + 6 + 5 + 6).

It is a d-powerful number, because it can be written as 1 + 3¹⁰ + 6⁵ + 3¹⁰ + 5 + 6⁵ .

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2761 + ... + 2808.

2¹³³⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

133656 is an abundant number, since it is smaller than the sum of its proper divisors (200544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133656 is a wasteful number, since it uses less digits than its factorization.

133656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578 (or 5574 counting only the distinct ones).

The product of its digits is 1620, while the sum is 24.

The square root of 133656 is about 365.5899342159. The cubic root of 133656 is about 51.1284727128.

Adding to 133656 its reverse (656331), we get a palindrome (789987).

The spelling of 133656 in words is "one hundred thirty-three thousand, six hundred fifty-six".