133568913 has 8 divisors (see below), whose sum is σ = 178154848. Its totient is φ = 89014464.

The previous prime is 133568909. The next prime is 133568921. The reversal of 133568913 is 319865331.

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

It is not a de Polignac number, because 133568913 - 2² = 133568909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133568923) 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, 5070 + ... + 17112.

It is an arithmetic number, because the mean of its divisors is an integer number (22269356).

Almost surely, 2^133568913 is an apocalyptic number.

It is an amenable number.

133568913 is a deficient number, since it is larger than the sum of its proper divisors (44585935).

133568913 is a wasteful number, since it uses less digits than its factorization.

133568913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15743.

The product of its digits is 58320, while the sum is 39.

The square root of 133568913 is about 11557.2017807080. The cubic root of 133568913 is about 511.1736561019.

The spelling of 133568913 in words is "one hundred thirty-three million, five hundred sixty-eight thousand, nine hundred thirteen".