133139181 has 16 divisors (see below), whose sum is σ = 203337344. Its totient is φ = 75907584.

The previous prime is 133139173. The next prime is 133139191. The reversal of 133139181 is 181931331.

It is a happy number.

It is not a de Polignac number, because 133139181 - 2³ = 133139173 is a prime.

It is a super-2 number, since 2×133139181² = 35452083034701522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133139161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2661 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (12708584).

Almost surely, 2^133139181 is an apocalyptic number.

It is an amenable number.

133139181 is a deficient number, since it is larger than the sum of its proper divisors (70198163).

133139181 is a wasteful number, since it uses less digits than its factorization.

133139181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14340.

The product of its digits is 1944, while the sum is 30.

The square root of 133139181 is about 11538.5952784557. The cubic root of 133139181 is about 510.6248665321.

The spelling of 133139181 in words is "one hundred thirty-three million, one hundred thirty-nine thousand, one hundred eighty-one".