2231665 has 4 divisors (see below), whose sum is σ = 2678004. Its totient is φ = 1785328.

The previous prime is 2231653. The next prime is 2231681. The reversal of 2231665 is 5661322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 552049 = 1296^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231665 - 2¹⁵ = 2198897 is a prime.

It is a super-3 number, since 3×2231665³ = 33343275558903013875, which contains 333 as substring.

It is a d-powerful number, because it can be written as 2¹⁷ + 2²¹ + 3⁵ + 1 + 6² + 6² + 5⁵ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223162 + ... + 223171.

It is an arithmetic number, because the mean of its divisors is an integer number (669501).

2^2231665 is an apocalyptic number.

It is an amenable number.

2231665 is a deficient number, since it is larger than the sum of its proper divisors (446339).

2231665 is an equidigital number, since it uses as much as digits as its factorization.

2231665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446338.

The product of its digits is 2160, while the sum is 25.

The square root of 2231665 is about 1493.8758315201. The cubic root of 2231665 is about 130.6801629761.

Adding to 2231665 its reverse (5661322), we get a palindrome (7892987).

The spelling of 2231665 in words is "two million, two hundred thirty-one thousand, six hundred sixty-five".