133550181 has 16 divisors (see below), whose sum is σ = 209491200. Its totient is φ = 83795904.

The previous prime is 133550159. The next prime is 133550233. The reversal of 133550181 is 181055331.

133550181 is a `hidden beast` number, since 1 + 33 + 550 + 1 + 81 = 666.

It is not a de Polignac number, because 133550181 - 2⁵ = 133550149 is a prime.

It is a super-2 number, since 2×133550181² = 35671301690265522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133550101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145021 + ... + 145938.

It is an arithmetic number, because the mean of its divisors is an integer number (13093200).

Almost surely, 2^133550181 is an apocalyptic number.

It is an amenable number.

133550181 is a deficient number, since it is larger than the sum of its proper divisors (75941019).

133550181 is a wasteful number, since it uses less digits than its factorization.

133550181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290985 (or 290979 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 133550181 is about 11556.3913485136. The cubic root of 133550181 is about 511.1497589431.

The spelling of 133550181 in words is "one hundred thirty-three million, five hundred fifty thousand, one hundred eighty-one".