2819220865 has 4 divisors (see below), whose sum is σ = 3383065044. Its totient is φ = 2255376688.

The previous prime is 2819220853. The next prime is 2819220869. The reversal of 2819220865 is 5680229182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5680229182 = 2 ⋅2840114591.

It can be written as a sum of positive squares in 2 ways, for example, as 419102784 + 2400118081 = 20472^2 + 48991^2 .

It is a cyclic number.

It is not a de Polignac number, because 2819220865 - 2⁷ = 2819220737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2819220869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281922082 + ... + 281922091.

It is an arithmetic number, because the mean of its divisors is an integer number (845766261).

Almost surely, 2^2819220865 is an apocalyptic number.

It is an amenable number.

2819220865 is a deficient number, since it is larger than the sum of its proper divisors (563844179).

2819220865 is an equidigital number, since it uses as much as digits as its factorization.

2819220865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563844178.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 2819220865 is about 53096.3357021932. The cubic root of 2819220865 is about 1412.6775179821.

The spelling of 2819220865 in words is "two billion, eight hundred nineteen million, two hundred twenty thousand, eight hundred sixty-five".