139181 has 8 divisors (see below), whose sum is σ = 162240. Its totient is φ = 116928.

The previous prime is 139177. The next prime is 139187. The reversal of 139181 is 181931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139181 - 2² = 139177 is a prime.

It is a super-2 number, since 2×139181² = 38742701522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139181.

It is not an unprimeable number, because it can be changed into a prime (139187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (20280).

2¹³⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

139181 is a deficient number, since it is larger than the sum of its proper divisors (23059).

139181 is an equidigital number, since it uses as much as digits as its factorization.

139181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403.

The product of its digits is 216, while the sum is 23.

The square root of 139181 is about 373.0696985819. The cubic root of 139181 is about 51.8234892947.

The spelling of 139181 in words is "one hundred thirty-nine thousand, one hundred eighty-one".