101139 has 4 divisors (see below), whose sum is σ = 134856. Its totient is φ = 67424.

The previous prime is 101119. The next prime is 101141. The reversal of 101139 is 931101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101139 - 2⁵ = 101107 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (101119) 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, 16854 + ... + 16859.

It is an arithmetic number, because the mean of its divisors is an integer number (33714).

2¹⁰¹¹³⁹ is an apocalyptic number.

101139 is a deficient number, since it is larger than the sum of its proper divisors (33717).

101139 is an equidigital number, since it uses as much as digits as its factorization.

101139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33716.

The product of its (nonzero) digits is 27, while the sum is 15.

The square root of 101139 is about 318.0235840311. The cubic root of 101139 is about 46.5914491239.

Subtracting from 101139 its sum of digits (15), we obtain a square (101124 = 318²).

The spelling of 101139 in words is "one hundred one thousand, one hundred thirty-nine".