133129281 has 8 divisors (see below), whose sum is σ = 178498080. Its totient is φ = 88256672.

The previous prime is 133129273. The next prime is 133129291. The reversal of 133129281 is 182921331.

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 133129281 - 2³ = 133129273 is a prime.

It is a super-2 number, since 2×133129281² = 35446810919153922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133129291) 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, 123420 + ... + 124493.

It is an arithmetic number, because the mean of its divisors is an integer number (22312260).

Almost surely, 2^133129281 is an apocalyptic number.

It is an amenable number.

133129281 is a deficient number, since it is larger than the sum of its proper divisors (45368799).

133129281 is a wasteful number, since it uses less digits than its factorization.

133129281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248095.

The product of its digits is 2592, while the sum is 30.

The square root of 133129281 is about 11538.1662754530. The cubic root of 133129281 is about 510.6122098234.

The spelling of 133129281 in words is "one hundred thirty-three million, one hundred twenty-nine thousand, two hundred eighty-one".