2209161 has 4 divisors (see below), whose sum is σ = 2945552. Its totient is φ = 1472772.

The previous prime is 2209117. The next prime is 2209169. The reversal of 2209161 is 1619022.

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 not a de Polignac number, because 2209161 - 2¹¹ = 2207113 is a prime.

It is a D-number.

It is a Duffinian number.

2209161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2209169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368191 + ... + 368196.

It is an arithmetic number, because the mean of its divisors is an integer number (736388).

2^2209161 is an apocalyptic number.

It is an amenable number.

2209161 is a deficient number, since it is larger than the sum of its proper divisors (736391).

2209161 is an equidigital number, since it uses as much as digits as its factorization.

2209161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736390.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2209161 is about 1486.3246617075. The cubic root of 2209161 is about 130.2394207216.

The spelling of 2209161 in words is "two million, two hundred nine thousand, one hundred sixty-one".