133791691 has 8 divisors (see below), whose sum is σ = 150663168. Its totient is φ = 117705000.

The previous prime is 133791689. The next prime is 133791709. The reversal of 133791691 is 196197331.

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 133791691 - 2¹ = 133791689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133791641) 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, 195835 + ... + 196516.

It is an arithmetic number, because the mean of its divisors is an integer number (18832896).

Almost surely, 2^133791691 is an apocalyptic number.

133791691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133791691 is a deficient number, since it is larger than the sum of its proper divisors (16871477).

133791691 is a wasteful number, since it uses less digits than its factorization.

133791691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392393.

The product of its digits is 30618, while the sum is 40.

The square root of 133791691 is about 11566.8358248918. The cubic root of 133791691 is about 511.4576917325.

The spelling of 133791691 in words is "one hundred thirty-three million, seven hundred ninety-one thousand, six hundred ninety-one".