2173261 has 4 divisors (see below), whose sum is σ = 2179872. Its totient is φ = 2166652.

The previous prime is 2173243. The next prime is 2173307. The reversal of 2173261 is 1623712.

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 2173261 - 2¹⁷ = 2042189 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 (2173361) 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, 2785 + ... + 3478.

It is an arithmetic number, because the mean of its divisors is an integer number (544968).

2^2173261 is an apocalyptic number.

It is an amenable number.

2173261 is a deficient number, since it is larger than the sum of its proper divisors (6611).

2173261 is an equidigital number, since it uses as much as digits as its factorization.

2173261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610.

The product of its digits is 504, while the sum is 22.

The square root of 2173261 is about 1474.1984262643. The cubic root of 2173261 is about 129.5300785317.

Adding to 2173261 its reverse (1623712), we get a palindrome (3796973).

The spelling of 2173261 in words is "two million, one hundred seventy-three thousand, two hundred sixty-one".