133261871 has 4 divisors (see below), whose sum is σ = 133417152. Its totient is φ = 133106592.

The previous prime is 133261867. The next prime is 133261883. The reversal of 133261871 is 178162331.

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

It is a cyclic number.

It is not a de Polignac number, because 133261871 - 2² = 133261867 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 (133261831) 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 3 ways as a sum of consecutive naturals, for example, 76346 + ... + 78071.

It is an arithmetic number, because the mean of its divisors is an integer number (33354288).

Almost surely, 2^133261871 is an apocalyptic number.

133261871 is a deficient number, since it is larger than the sum of its proper divisors (155281).

133261871 is an equidigital number, since it uses as much as digits as its factorization.

133261871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155280.

The product of its digits is 6048, while the sum is 32.

The square root of 133261871 is about 11543.9105592516. The cubic root of 133261871 is about 510.7816681847.

The spelling of 133261871 in words is "one hundred thirty-three million, two hundred sixty-one thousand, eight hundred seventy-one".