2001122009 has 8 divisors (see below), whose sum is σ = 2106903840. Its totient is φ = 1895386176.
The previous prime is 2001121999. The next prime is 2001122069. The reversal of 2001122009 is 9002211002.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2001122009 - 28 = 2001121753 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2001122069) 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, 111809 + ... + 128465.
It is an arithmetic number, because the mean of its divisors is an integer number (263362980).
Almost surely, 22001122009 is an apocalyptic number.
It is an amenable number.
2001122009 is a deficient number, since it is larger than the sum of its proper divisors (105781831).
2001122009 is a wasteful number, since it uses less digits than its factorization.
2001122009 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 22999.
The product of its (nonzero) digits is 72, while the sum is 17.
The square root of 2001122009 is about 44733.9022330939. The cubic root of 2001122009 is about 1260.1566129759.
The spelling of 2001122009 in words is "two billion, one million, one hundred twenty-two thousand, nine".
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