209132161 has 4 divisors (see below), whose sum is σ = 239008192. Its totient is φ = 179256132.

The previous prime is 209132159. The next prime is 209132173. The reversal of 209132161 is 161231902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209132161 - 2¹ = 209132159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209132101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14938005 + ... + 14938018.

It is an arithmetic number, because the mean of its divisors is an integer number (59752048).

Almost surely, 2^209132161 is an apocalyptic number.

It is an amenable number.

209132161 is a deficient number, since it is larger than the sum of its proper divisors (29876031).

209132161 is an equidigital number, since it uses as much as digits as its factorization.

209132161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29876030.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 209132161 is about 14461.4024561935. The cubic root of 209132161 is about 593.5722763226.

The spelling of 209132161 in words is "two hundred nine million, one hundred thirty-two thousand, one hundred sixty-one".