2001811969 has 8 divisors (see below), whose sum is σ = 2089319040. Its totient is φ = 1914344256.

The previous prime is 2001811967. The next prime is 2001811979. The reversal of 2001811969 is 9691181002.

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 2001811969 - 2¹ = 2001811967 is a prime.

It is a super-2 number, since 2×2001811969² = 8014502318463313922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001811963) 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, 148492 + ... + 161410.

It is an arithmetic number, because the mean of its divisors is an integer number (261164880).

Almost surely, 2^2001811969 is an apocalyptic number.

It is an amenable number.

2001811969 is a deficient number, since it is larger than the sum of its proper divisors (87507071).

2001811969 is a wasteful number, since it uses less digits than its factorization.

2001811969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19679.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 2001811969 is about 44741.6133929030. The cubic root of 2001811969 is about 1260.3014246942.

The spelling of 2001811969 in words is "two billion, one million, eight hundred eleven thousand, nine hundred sixty-nine".