2569221409 has 6 divisors (see below), whose sum is σ = 2572771190. Its totient is φ = 2565675936.

The previous prime is 2569221397. The next prime is 2569221419. The reversal of 2569221409 is 9041229652.

It can be written as a sum of positive squares in 3 ways, for example, as 6027025 + 2563194384 = 2455^2 + 50628^2 .

It is not a de Polignac number, because 2569221409 - 2⁵ = 2569221377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2569221419) 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 5 ways as a sum of consecutive naturals, for example, 1228837 + ... + 1230925.

Almost surely, 2^2569221409 is an apocalyptic number.

It is an amenable number.

2569221409 is a deficient number, since it is larger than the sum of its proper divisors (3549781).

2569221409 is an frugal number, since it uses more digits than its factorization.

2569221409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 3198 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 2569221409 is about 50687.4876966693. The cubic root of 2569221409 is about 1369.6213294467.

The spelling of 2569221409 in words is "two billion, five hundred sixty-nine million, two hundred twenty-one thousand, four hundred nine".