133893791 has 4 divisors (see below), whose sum is σ = 133931784. Its totient is φ = 133855800.

The previous prime is 133893763. The next prime is 133893797. The reversal of 133893791 is 197398331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133893791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133893797) 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, 13100 + ... + 20961.

It is an arithmetic number, because the mean of its divisors is an integer number (33482946).

Almost surely, 2^133893791 is an apocalyptic number.

133893791 is a deficient number, since it is larger than the sum of its proper divisors (37993).

133893791 is an equidigital number, since it uses as much as digits as its factorization.

133893791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37992.

The product of its digits is 122472, while the sum is 44.

The square root of 133893791 is about 11571.2484633249. The cubic root of 133893791 is about 511.5877609770.

The spelling of 133893791 in words is "one hundred thirty-three million, eight hundred ninety-three thousand, seven hundred ninety-one".