2113666 has 4 divisors (see below), whose sum is σ = 3170502. Its totient is φ = 1056832.

The previous prime is 2113651. The next prime is 2113667. The reversal of 2113666 is 6663112.

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

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 1042441 = 1035^2 + 1021^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2113666.

It is not an unprimeable number, because it can be changed into a prime (2113667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528415 + ... + 528418.

2^2113666 is an apocalyptic number.

2113666 is a deficient number, since it is larger than the sum of its proper divisors (1056836).

2113666 is a wasteful number, since it uses less digits than its factorization.

2113666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056835.

The product of its digits is 1296, while the sum is 25.

The square root of 2113666 is about 1453.8452462350. The cubic root of 2113666 is about 128.3351001425.

Adding to 2113666 its reverse (6663112), we get a palindrome (8776778).

The spelling of 2113666 in words is "two million, one hundred thirteen thousand, six hundred sixty-six".