133838181 has 6 divisors (see below), whose sum is σ = 193321830. Its totient is φ = 89225448.

The previous prime is 133838171. The next prime is 133838189. The reversal of 133838181 is 181838331.

It can be written as a sum of positive squares in only one way, i.e., 126900225 + 6937956 = 11265^2 + 2634^2 .

It is not a de Polignac number, because 133838181 - 2⁵ = 133838149 is a prime.

It is a super-2 number, since 2×133838181² = 35825317386777522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133838189) 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 5 ways as a sum of consecutive naturals, for example, 7435446 + ... + 7435463.

It is an arithmetic number, because the mean of its divisors is an integer number (32220305).

Almost surely, 2^133838181 is an apocalyptic number.

It is an amenable number.

133838181 is a deficient number, since it is larger than the sum of its proper divisors (59483649).

133838181 is a wasteful number, since it uses less digits than its factorization.

133838181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14870915 (or 14870912 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 133838181 is about 11568.8452751344. The cubic root of 133838181 is about 511.5169253923.

The spelling of 133838181 in words is "one hundred thirty-three million, eight hundred thirty-eight thousand, one hundred eighty-one".