109569 has 4 divisors (see below), whose sum is σ = 146096. Its totient is φ = 73044.

The previous prime is 109567. The next prime is 109579. The reversal of 109569 is 965901.

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.

It is not a de Polignac number, because 109569 - 2¹ = 109567 is a prime.

It is a super-2 number, since 2×109569² = 24010731522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

109569 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (109567) 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, 18259 + ... + 18264.

It is an arithmetic number, because the mean of its divisors is an integer number (36524).

It is a Proth number, since it is equal to 107 ⋅ 2¹⁰ + 1 and 107 < 2¹⁰.

2¹⁰⁹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

109569 is a deficient number, since it is larger than the sum of its proper divisors (36527).

109569 is an equidigital number, since it uses as much as digits as its factorization.

109569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36526.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 109569 is about 331.0120843716. The cubic root of 109569 is about 47.8515378133.

The spelling of 109569 in words is "one hundred nine thousand, five hundred sixty-nine".