2112661 has 4 divisors (see below), whose sum is σ = 2128000. Its totient is φ = 2097324.

The previous prime is 2112631. The next prime is 2112683. The reversal of 2112661 is 1662112.

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 2112661 - 2⁷ = 2112533 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 (2112601) 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, 7461 + ... + 7738.

It is an arithmetic number, because the mean of its divisors is an integer number (532000).

2^2112661 is an apocalyptic number.

It is an amenable number.

2112661 is a deficient number, since it is larger than the sum of its proper divisors (15339).

2112661 is a wasteful number, since it uses less digits than its factorization.

2112661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15338.

The product of its digits is 144, while the sum is 19.

The square root of 2112661 is about 1453.4995700034. The cubic root of 2112661 is about 128.3147567797.

Adding to 2112661 its reverse (1662112), we get a palindrome (3774773).

The spelling of 2112661 in words is "two million, one hundred twelve thousand, six hundred sixty-one".