2820911009 has 16 divisors (see below), whose sum is σ = 3281178240. Its totient is φ = 2375030400.

The previous prime is 2820911003. The next prime is 2820911033. The reversal of 2820911009 is 9001190282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2820911009 - 2²⁸ = 2552475553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2820911003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783317 + ... + 786909.

It is an arithmetic number, because the mean of its divisors is an integer number (205073640).

Almost surely, 2^2820911009 is an apocalyptic number.

It is an amenable number.

2820911009 is a deficient number, since it is larger than the sum of its proper divisors (460267231).

2820911009 is a wasteful number, since it uses less digits than its factorization.

2820911009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 2820911009 is about 53112.2491427354. The cubic root of 2820911009 is about 1412.9597651668.

The spelling of 2820911009 in words is "two billion, eight hundred twenty million, nine hundred eleven thousand, nine".