2001209511 has 8 divisors (see below), whose sum is σ = 3049462144. Its totient is φ = 1143548280.

The previous prime is 2001209503. The next prime is 2001209513. The reversal of 2001209511 is 1159021002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001209511 - 2³ = 2001209503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 95295691 = 2001209511 / (2 + 0 + 0 + 1 + 2 + 0 + 9 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001209513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47647825 + ... + 47647866.

It is an arithmetic number, because the mean of its divisors is an integer number (381182768).

Almost surely, 2^2001209511 is an apocalyptic number.

2001209511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2001209511 is a deficient number, since it is larger than the sum of its proper divisors (1048252633).

2001209511 is an equidigital number, since it uses as much as digits as its factorization.

2001209511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95295701.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 2001209511 is about 44734.8802502030. The cubic root of 2001209511 is about 1260.1749801080.

The spelling of 2001209511 in words is "two billion, one million, two hundred nine thousand, five hundred eleven".