109005665 has 4 divisors (see below), whose sum is σ = 130806804. Its totient is φ = 87204528.

The previous prime is 109005629. The next prime is 109005691. The reversal of 109005665 is 566500901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566500901 = 7187 ⋅78823.

It can be written as a sum of positive squares in 2 ways, for example, as 14371681 + 94633984 = 3791^2 + 9728^2 .

It is a cyclic number.

It is not a de Polignac number, because 109005665 - 2¹⁴ = 108989281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10900562 + ... + 10900571.

It is an arithmetic number, because the mean of its divisors is an integer number (32701701).

Almost surely, 2^109005665 is an apocalyptic number.

It is an amenable number.

109005665 is a deficient number, since it is larger than the sum of its proper divisors (21801139).

109005665 is an equidigital number, since it uses as much as digits as its factorization.

109005665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21801138.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 109005665 is about 10440.5778096808. The cubic root of 109005665 is about 477.6938934617.

The spelling of 109005665 in words is "one hundred nine million, five thousand, six hundred sixty-five".