109643565 has 16 divisors (see below), whose sum is σ = 175935168. Its totient is φ = 58308096.

The previous prime is 109643549. The next prime is 109643609. The reversal of 109643565 is 565346901.

It is not a de Polignac number, because 109643565 - 2⁴ = 109643549 is a prime.

It is a super-2 number, since 2×109643565² = 24043422691818450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5059 + ... + 15648.

It is an arithmetic number, because the mean of its divisors is an integer number (10995948).

Almost surely, 2^109643565 is an apocalyptic number.

109643565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109643565 is a deficient number, since it is larger than the sum of its proper divisors (66291603).

109643565 is a wasteful number, since it uses less digits than its factorization.

109643565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21068.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 109643565 is about 10471.0823222817. The cubic root of 109643565 is about 478.6239015542.

The spelling of 109643565 in words is "one hundred nine million, six hundred forty-three thousand, five hundred sixty-five".