2141561 has 4 divisors (see below), whose sum is σ = 2144592. Its totient is φ = 2138532.

The previous prime is 2141549. The next prime is 2141569. The reversal of 2141561 is 1651412.

2141561 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2141561 - 2⁶ = 2141497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2141569) 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, 170 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (536148).

2^2141561 is an apocalyptic number.

It is an amenable number.

2141561 is a deficient number, since it is larger than the sum of its proper divisors (3031).

2141561 is a wasteful number, since it uses less digits than its factorization.

2141561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030.

The product of its digits is 240, while the sum is 20.

The square root of 2141561 is about 1463.4073253883. The cubic root of 2141561 is about 128.8971999144.

Adding to 2141561 its reverse (1651412), we get a palindrome (3792973).

The spelling of 2141561 in words is "two million, one hundred forty-one thousand, five hundred sixty-one".