109969 has 4 divisors (see below), whose sum is σ = 110644. Its totient is φ = 109296.

The previous prime is 109961. The next prime is 109987. The reversal of 109969 is 969901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 44944 + 65025 = 212^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 109969 - 2³ = 109961 is a prime.

It is a super-2 number, since 2×109969² = 24186361922, which contains 22 as substring.

It is a Duffinian number.

109969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (109961) 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, 79 + ... + 475.

It is an arithmetic number, because the mean of its divisors is an integer number (27661).

2¹⁰⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

109969 is a deficient number, since it is larger than the sum of its proper divisors (675).

109969 is an equidigital number, since it uses as much as digits as its factorization.

109969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 109969 is about 331.6157414840. The cubic root of 109969 is about 47.9096971170.

The spelling of 109969 in words is "one hundred nine thousand, nine hundred sixty-nine".