8001689121 has 12 divisors (see below), whose sum is σ = 12060517248. Its totient is φ = 5102526264.

The previous prime is 8001689117. The next prime is 8001689131. The reversal of 8001689121 is 1219861008.

It is not a de Polignac number, because 8001689121 - 2² = 8001689117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8001689131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19327545 + ... + 19327958.

It is an arithmetic number, because the mean of its divisors is an integer number (1005043104).

Almost surely, 2^8001689121 is an apocalyptic number.

It is an amenable number.

8001689121 is a deficient number, since it is larger than the sum of its proper divisors (4058828127).

8001689121 is a wasteful number, since it uses less digits than its factorization.

8001689121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38655532 (or 38655529 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 8001689121 is about 89452.1610750685. The cubic root of 8001689121 is about 2000.1407501778.

The spelling of 8001689121 in words is "eight billion, one million, six hundred eighty-nine thousand, one hundred twenty-one".