2011572909 has 6 divisors (see below), whose sum is σ = 2905605326. Its totient is φ = 1341048600.

The previous prime is 2011572803. The next prime is 2011572967. The reversal of 2011572909 is 9092751102.

It can be written as a sum of positive squares in only one way, i.e., 1211248809 + 800324100 = 34803^2 + 28290^2 .

It is not a de Polignac number, because 2011572909 - 2⁹ = 2011572397 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 (2011571909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111754042 + ... + 111754059.

Almost surely, 2^2011572909 is an apocalyptic number.

It is an amenable number.

2011572909 is a deficient number, since it is larger than the sum of its proper divisors (894032417).

2011572909 is a wasteful number, since it uses less digits than its factorization.

2011572909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223508107 (or 223508104 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 2011572909 is about 44850.5619697234. The cubic root of 2011572909 is about 1262.3465361809.

The spelling of 2011572909 in words is "two billion, eleven million, five hundred seventy-two thousand, nine hundred nine".