109209105 has 24 divisors (see below), whose sum is σ = 200432232. Its totient is φ = 54818304.

The previous prime is 109209101. The next prime is 109209119. The reversal of 109209105 is 501902901.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11614464 + 97594641 = 3408^2 + 9879^2 .

It is not a de Polignac number, because 109209105 - 2² = 109209101 is a prime.

It is a super-2 number, since 2×109209105² = 23853257229802050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (109209101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70614 + ... + 72143.

It is an arithmetic number, because the mean of its divisors is an integer number (8351343).

Almost surely, 2^109209105 is an apocalyptic number.

109209105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109209105 is a deficient number, since it is larger than the sum of its proper divisors (91223127).

109209105 is a wasteful number, since it uses less digits than its factorization.

109209105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142785 (or 142782 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 109209105 is about 10450.3160239296. The cubic root of 109209105 is about 477.9908861319.

The spelling of 109209105 in words is "one hundred nine million, two hundred nine thousand, one hundred five".