100139 has 4 divisors (see below), whose sum is σ = 107856. Its totient is φ = 92424.

The previous prime is 100129. The next prime is 100151. The reversal of 100139 is 931001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931001 = 347 ⋅2683.

It is a cyclic number.

It is not a de Polignac number, because 100139 - 2¹² = 96043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3839 + ... + 3864.

It is an arithmetic number, because the mean of its divisors is an integer number (26964).

2¹⁰⁰¹³⁹ is an apocalyptic number.

100139 is a deficient number, since it is larger than the sum of its proper divisors (7717).

100139 is an equidigital number, since it uses as much as digits as its factorization.

100139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716.

The product of its (nonzero) digits is 27, while the sum is 14.

The square root of 100139 is about 316.4474679943. The cubic root of 100139 is about 46.4373844076.

The spelling of 100139 in words is "one hundred thousand, one hundred thirty-nine".