133432661 has 4 divisors (see below), whose sum is σ = 133470924. Its totient is φ = 133394400.

The previous prime is 133432639. The next prime is 133432667. The reversal of 133432661 is 166234331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166234331 = 929 ⋅178939.

It can be written as a sum of positive squares in 2 ways, for example, as 44488900 + 88943761 = 6670^2 + 9431^2 .

It is a cyclic number.

It is not a de Polignac number, because 133432661 - 2¹⁴ = 133416277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133432667) 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, 13310 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (33367731).

Almost surely, 2^133432661 is an apocalyptic number.

It is an amenable number.

133432661 is a deficient number, since it is larger than the sum of its proper divisors (38263).

133432661 is an equidigital number, since it uses as much as digits as its factorization.

133432661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38262.

The product of its digits is 7776, while the sum is 29.

The square root of 133432661 is about 11551.3055972042. The cubic root of 133432661 is about 510.9997829869. Note that the first 3 decimals are identical.

Adding to 133432661 its reverse (166234331), we get a palindrome (299666992).

The spelling of 133432661 in words is "one hundred thirty-three million, four hundred thirty-two thousand, six hundred sixty-one".