2196561 has 4 divisors (see below), whose sum is σ = 2928752. Its totient is φ = 1464372.

The previous prime is 2196559. The next prime is 2196563. The reversal of 2196561 is 1656912.

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 an interprime number because it is at equal distance from previous prime (2196559) and next prime (2196563).

It is not a de Polignac number, because 2196561 - 2¹ = 2196559 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2196563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366091 + ... + 366096.

It is an arithmetic number, because the mean of its divisors is an integer number (732188).

2^2196561 is an apocalyptic number.

It is an amenable number.

2196561 is a deficient number, since it is larger than the sum of its proper divisors (732191).

2196561 is an equidigital number, since it uses as much as digits as its factorization.

2196561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732190.

The product of its digits is 3240, while the sum is 30.

The square root of 2196561 is about 1482.0799573572. The cubic root of 2196561 is about 129.9913406461.

The spelling of 2196561 in words is "two million, one hundred ninety-six thousand, five hundred sixty-one".