133868559 has 8 divisors (see below), whose sum is σ = 194717952. Its totient is φ = 81132440.

The previous prime is 133868521. The next prime is 133868561. The reversal of 133868559 is 955868331.

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 133868559 - 2⁷ = 133868431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133868569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2028279 + ... + 2028344.

It is an arithmetic number, because the mean of its divisors is an integer number (24339744).

Almost surely, 2^133868559 is an apocalyptic number.

133868559 is a deficient number, since it is larger than the sum of its proper divisors (60849393).

133868559 is a wasteful number, since it uses less digits than its factorization.

133868559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056637.

The product of its digits is 777600, while the sum is 48.

The square root of 133868559 is about 11570.1581233793. The cubic root of 133868559 is about 511.5556230832. Note that the first 3 decimals are identical.

It can be divided in two parts, 13386 and 8559, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 133868559 in words is "one hundred thirty-three million, eight hundred sixty-eight thousand, five hundred fifty-nine".