2140661 has 4 divisors (see below), whose sum is σ = 2152800. Its totient is φ = 2128524.

The previous prime is 2140637. The next prime is 2140681. The reversal of 2140661 is 1660412.

It is a happy number.

2140661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2140661 - 2¹⁴ = 2124277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (538200).

2^2140661 is an apocalyptic number.

It is an amenable number.

2140661 is a deficient number, since it is larger than the sum of its proper divisors (12139).

2140661 is a wasteful number, since it uses less digits than its factorization.

2140661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12138.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2140661 is about 1463.0997915385. The cubic root of 2140661 is about 128.8791408546.

Subtracting from 2140661 its reverse (1660412), we obtain a square (480249 = 693²).

The spelling of 2140661 in words is "two million, one hundred forty thousand, six hundred sixty-one".