2201684861 has 4 divisors (see below), whose sum is σ = 2204248800. Its totient is φ = 2199120924.

The previous prime is 2201684851. The next prime is 2201684899. The reversal of 2201684861 is 1684861022.

It is a happy number.

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 2201684861 - 2¹⁰ = 2201683837 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 (2201684851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280681 + ... + 1282398.

It is an arithmetic number, because the mean of its divisors is an integer number (551062200).

Almost surely, 2^2201684861 is an apocalyptic number.

It is an amenable number.

2201684861 is a deficient number, since it is larger than the sum of its proper divisors (2563939).

2201684861 is an equidigital number, since it uses as much as digits as its factorization.

2201684861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563938.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 2201684861 is about 46922.1148393804. The cubic root of 2201684861 is about 1300.9233796757.

The spelling of 2201684861 in words is "two billion, two hundred one million, six hundred eighty-four thousand, eight hundred sixty-one".