197109 has 18 divisors (see below), whose sum is σ = 314678. Its totient is φ = 118800.

The previous prime is 197101. The next prime is 197117. The reversal of 197109 is 901791.

197109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (197101) and next prime (197117).

It can be written as a sum of positive squares in only one way, i.e., 108900 + 88209 = 330^2 + 297^2 .

It is not a de Polignac number, because 197109 - 2³ = 197101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 999 + ... + 1179.

2¹⁹⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

197109 is a deficient number, since it is larger than the sum of its proper divisors (117569).

197109 is a wasteful number, since it uses less digits than its factorization.

197109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 197109 is about 443.9695935534. The cubic root of 197109 is about 58.1972082127.

Adding to 197109 its sum of digits (27), we get a square (197136 = 444²).

The spelling of 197109 in words is "one hundred ninety-seven thousand, one hundred nine".