109643 has 4 divisors (see below), whose sum is σ = 111048. Its totient is φ = 108240.

The previous prime is 109639. The next prime is 109661. The reversal of 109643 is 346901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346901 = 41 ⋅8461.

It is a cyclic number.

It is not a de Polignac number, because 109643 - 2² = 109639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109663) 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, 578 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (27762).

2¹⁰⁹⁶⁴³ is an apocalyptic number.

109643 is a deficient number, since it is larger than the sum of its proper divisors (1405).

109643 is an equidigital number, since it uses as much as digits as its factorization.

109643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 109643 is about 331.1238439013. The cubic root of 109643 is about 47.8623079427.

The spelling of 109643 in words is "one hundred nine thousand, six hundred forty-three".