2231666 has 16 divisors (see below), whose sum is σ = 3504600. Its totient is φ = 1064448.

The previous prime is 2231653. The next prime is 2231681. The reversal of 2231666 is 6661322.

It can be written as a sum of positive squares in 4 ways, for example, as 2002225 + 229441 = 1415^2 + 479^2 .

It is a super-3 number, since 3×2231666³ = 33343320381881148888, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6146 + ... + 6498.

2^2231666 is an apocalyptic number.

2231666 is a deficient number, since it is larger than the sum of its proper divisors (1272934).

2231666 is a wasteful number, since it uses less digits than its factorization.

2231666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493.

The product of its digits is 2592, while the sum is 26.

The square root of 2231666 is about 1493.8761662199. The cubic root of 2231666 is about 130.6801824952.

Adding to 2231666 its reverse (6661322), we get a palindrome (8892988).

The spelling of 2231666 in words is "two million, two hundred thirty-one thousand, six hundred sixty-six".