109959 has 4 divisors (see below), whose sum is σ = 146616. Its totient is φ = 73304.

The previous prime is 109943. The next prime is 109961. The reversal of 109959 is 959901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959901 = 3 ⋅319967.

It is a cyclic number.

It is not a de Polignac number, because 109959 - 2⁴ = 109943 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109919) 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, 18324 + ... + 18329.

It is an arithmetic number, because the mean of its divisors is an integer number (36654).

2¹⁰⁹⁹⁵⁹ is an apocalyptic number.

109959 is a deficient number, since it is larger than the sum of its proper divisors (36657).

109959 is an equidigital number, since it uses as much as digits as its factorization.

109959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36656.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 109959 is about 331.6006634493. The cubic root of 109959 is about 47.9082448547.

The spelling of 109959 in words is "one hundred nine thousand, nine hundred fifty-nine".