133987871 has 8 divisors (see below), whose sum is σ = 138842880. Its totient is φ = 129211992.

The previous prime is 133987853. The next prime is 133987901. The reversal of 133987871 is 178789331.

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 133987871 - 2¹⁸ = 133725727 is a prime.

It is a super-2 number, since 2×133987871² = 35905499150225282, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133987831) 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, 16325 + ... + 23118.

It is an arithmetic number, because the mean of its divisors is an integer number (17355360).

Almost surely, 2^133987871 is an apocalyptic number.

133987871 is a deficient number, since it is larger than the sum of its proper divisors (4855009).

133987871 is an equidigital number, since it uses as much as digits as its factorization.

133987871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39565.

The product of its digits is 254016, while the sum is 47.

The square root of 133987871 is about 11575.3129979280. The cubic root of 133987871 is about 511.7075547025.

The spelling of 133987871 in words is "one hundred thirty-three million, nine hundred eighty-seven thousand, eight hundred seventy-one".