105139 has 4 divisors (see below), whose sum is σ = 107424. Its totient is φ = 102856.

The previous prime is 105137. The next prime is 105143. The reversal of 105139 is 931501.

105139 = T₄₂ + T₄₃ + ... + T₈₈.

105139 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931501 = 67 ⋅13903.

It is a cyclic number.

It is not a de Polignac number, because 105139 - 2¹ = 105137 is a prime.

It is a super-2 number, since 2×105139² = 22108418642, which contains 22 as substring.

It is a Duffinian number.

105139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (105137) 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, 1072 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (26856).

2¹⁰⁵¹³⁹ is an apocalyptic number.

105139 is a deficient number, since it is larger than the sum of its proper divisors (2285).

105139 is an equidigital number, since it uses as much as digits as its factorization.

105139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 105139 is about 324.2514456406. The cubic root of 105139 is about 47.1977483844.

The spelling of 105139 in words is "one hundred five thousand, one hundred thirty-nine".