133505871 has 16 divisors (see below), whose sum is σ = 184347648. Its totient is φ = 85852800.

The previous prime is 133505861. The next prime is 133505903. The reversal of 133505871 is 178505331.

It is not a de Polignac number, because 133505871 - 2⁶ = 133505807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133505851) 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, 28615 + ... + 32951.

It is an arithmetic number, because the mean of its divisors is an integer number (11521728).

Almost surely, 2^133505871 is an apocalyptic number.

133505871 is a deficient number, since it is larger than the sum of its proper divisors (50841777).

133505871 is a wasteful number, since it uses less digits than its factorization.

133505871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 133505871 is about 11554.4740685156. The cubic root of 133505871 is about 511.0932220144.

The spelling of 133505871 in words is "one hundred thirty-three million, five hundred five thousand, eight hundred seventy-one".