2219861 has 4 divisors (see below), whose sum is σ = 2536992. Its totient is φ = 1902732.

The previous prime is 2219849. The next prime is 2219869. The reversal of 2219861 is 1689122.

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 2219861 - 2⁶ = 2219797 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 (2219869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158555 + ... + 158568.

It is an arithmetic number, because the mean of its divisors is an integer number (634248).

2^2219861 is an apocalyptic number.

It is an amenable number.

2219861 is a deficient number, since it is larger than the sum of its proper divisors (317131).

2219861 is an equidigital number, since it uses as much as digits as its factorization.

2219861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317130.

The product of its digits is 1728, while the sum is 29.

The square root of 2219861 is about 1489.9197964991. The cubic root of 2219861 is about 130.4493522968.

The spelling of 2219861 in words is "two million, two hundred nineteen thousand, eight hundred sixty-one".