2309090809 has 9 divisors (see below), whose sum is σ = 2392904397. Its totient is φ = 2228121504.

The previous prime is 2309090761. The next prime is 2309090821. The reversal of 2309090809 is 9080909032.

It is a happy number.

The square root of 2309090809 is 48053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 59675625 + 2249415184 = 7725^2 + 47428^2 .

It is not a de Polignac number, because 2309090809 - 2¹³ = 2309082617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2309090879) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1392709 + ... + 1394365.

Almost surely, 2^2309090809 is an apocalyptic number.

2309090809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2309090809 is the 48053-rd square number.

2309090809 is the 24027-th centered octagonal number.

It is an amenable number.

2309090809 is a deficient number, since it is larger than the sum of its proper divisors (83813588).

2309090809 is an frugal number, since it uses more digits than its factorization.

2309090809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The cubic root of 2309090809 is about 1321.7429548619.

The spelling of 2309090809 in words is "two billion, three hundred nine million, ninety thousand, eight hundred nine".