133528861 has 4 divisors (see below), whose sum is σ = 133587324. Its totient is φ = 133470400.

The previous prime is 133528853. The next prime is 133528867. The reversal of 133528861 is 168825331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168825331 = 41 ⋅4117691.

It can be written as a sum of positive squares in 2 ways, for example, as 3705625 + 129823236 = 1925^2 + 11394^2 .

It is a cyclic number.

It is not a de Polignac number, because 133528861 - 2³ = 133528853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133528861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133528867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25660 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (33396831).

Almost surely, 2^133528861 is an apocalyptic number.

It is an amenable number.

133528861 is a deficient number, since it is larger than the sum of its proper divisors (58463).

133528861 is an equidigital number, since it uses as much as digits as its factorization.

133528861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58462.

The product of its digits is 34560, while the sum is 37.

The square root of 133528861 is about 11555.4688784142. The cubic root of 133528861 is about 511.1225574504.

The spelling of 133528861 in words is "one hundred thirty-three million, five hundred twenty-eight thousand, eight hundred sixty-one".