133691923 has 8 divisors (see below), whose sum is σ = 143723520. Its totient is φ = 123959880.

The previous prime is 133691911. The next prime is 133691941. The reversal of 133691923 is 329196331.

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 133691923 - 2⁵ = 133691891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133691953) 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 7 ways as a sum of consecutive naturals, for example, 73963 + ... + 75748.

It is an arithmetic number, because the mean of its divisors is an integer number (17965440).

Almost surely, 2^133691923 is an apocalyptic number.

133691923 is a deficient number, since it is larger than the sum of its proper divisors (10031597).

133691923 is a wasteful number, since it uses less digits than its factorization.

133691923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149777.

The product of its digits is 26244, while the sum is 37.

The square root of 133691923 is about 11562.5223459244. The cubic root of 133691923 is about 511.3305293767.

The spelling of 133691923 in words is "one hundred thirty-three million, six hundred ninety-one thousand, nine hundred twenty-three".