101109 has 4 divisors (see below), whose sum is σ = 134816. Its totient is φ = 67404.

The previous prime is 101107. The next prime is 101111. The reversal of 101109 is 901101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901101 = 3 ⋅300367.

It is an interprime number because it is at equal distance from previous prime (101107) and next prime (101111).

It is not a de Polignac number, because 101109 - 2¹ = 101107 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101094 and 101103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101107) 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, 16849 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (33704).

2¹⁰¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

101109 is a deficient number, since it is larger than the sum of its proper divisors (33707).

101109 is an equidigital number, since it uses as much as digits as its factorization.

101109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33706.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 101109 is about 317.9764142197. The cubic root of 101109 is about 46.5868419935.

It can be divided in two parts, 101 and 109, that added together give a triangular number (210 = T₂₀).

The spelling of 101109 in words is "one hundred one thousand, one hundred nine".