109445 has 16 divisors (see below), whose sum is σ = 155520. Its totient is φ = 72384.

The previous prime is 109441. The next prime is 109451. The reversal of 109445 is 544901.

109445 = 38² + 39² + ... + 72².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 109445 - 2² = 109441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1826 + ... + 1884.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2¹⁰⁹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

109445 is a deficient number, since it is larger than the sum of its proper divisors (46075).

109445 is an equidigital number, since it uses as much as digits as its factorization.

109445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 109445 is about 330.8247270081. The cubic root of 109445 is about 47.8334796932.

The spelling of 109445 in words is "one hundred nine thousand, four hundred forty-five".