133891917 has 16 divisors (see below), whose sum is σ = 188583360. Its totient is φ = 84264192.

The previous prime is 133891897. The next prime is 133891931. The reversal of 133891917 is 719198331.

It is not a de Polignac number, because 133891917 - 2⁶ = 133891853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133891957) 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 15 ways as a sum of consecutive naturals, for example, 12693 + ... + 20709.

It is an arithmetic number, because the mean of its divisors is an integer number (11786460).

Almost surely, 2^133891917 is an apocalyptic number.

It is an amenable number.

133891917 is a deficient number, since it is larger than the sum of its proper divisors (54691443).

133891917 is a wasteful number, since it uses less digits than its factorization.

133891917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332.

The product of its digits is 40824, while the sum is 42.

The square root of 133891917 is about 11571.1674864726. The cubic root of 133891917 is about 511.5853742098.

The spelling of 133891917 in words is "one hundred thirty-three million, eight hundred ninety-one thousand, nine hundred seventeen".