8109121841 has 4 divisors (see below), whose sum is σ = 8121733872. Its totient is φ = 8096509812.

The previous prime is 8109121807. The next prime is 8109121861. The reversal of 8109121841 is 1481219018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1481219018 = 2 ⋅740609509.

It is a cyclic number.

It is not a de Polignac number, because 8109121841 - 2¹⁸ = 8108859697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8109121861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6305051 + ... + 6306336.

It is an arithmetic number, because the mean of its divisors is an integer number (2030433468).

Almost surely, 2^8109121841 is an apocalyptic number.

It is an amenable number.

8109121841 is a deficient number, since it is larger than the sum of its proper divisors (12612031).

8109121841 is a wasteful number, since it uses less digits than its factorization.

8109121841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12612030.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 8109121841 is about 90050.6626349856. The cubic root of 8109121841 is about 2009.0524514926.

The spelling of 8109121841 in words is "eight billion, one hundred nine million, one hundred twenty-one thousand, eight hundred forty-one".