2001123149 has 8 divisors (see below), whose sum is σ = 2118086880. Its totient is φ = 1885323600.

The previous prime is 2001123139. The next prime is 2001123151. The reversal of 2001123149 is 9413211002.

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 2001123149 - 2¹² = 2001119053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001123109) 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 7 ways as a sum of consecutive naturals, for example, 287507 + ... + 294384.

It is an arithmetic number, because the mean of its divisors is an integer number (264760860).

Almost surely, 2^2001123149 is an apocalyptic number.

It is an amenable number.

2001123149 is a deficient number, since it is larger than the sum of its proper divisors (116963731).

2001123149 is a wasteful number, since it uses less digits than its factorization.

2001123149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582091.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2001123149 is about 44733.9149751059. The cubic root of 2001123149 is about 1260.1568522714.

The spelling of 2001123149 in words is "two billion, one million, one hundred twenty-three thousand, one hundred forty-nine".