6815247121 has 4 divisors (see below), whose sum is σ = 6856057152. Its totient is φ = 6774437092.

The previous prime is 6815247107. The next prime is 6815247163. The reversal of 6815247121 is 1217425186.

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.

It is a cyclic number.

It is not a de Polignac number, because 6815247121 - 2¹³ = 6815238929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6815247821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20404765 + ... + 20405098.

It is an arithmetic number, because the mean of its divisors is an integer number (1714014288).

Almost surely, 2^6815247121 is an apocalyptic number.

It is an amenable number.

6815247121 is a deficient number, since it is larger than the sum of its proper divisors (40810031).

6815247121 is a wasteful number, since it uses less digits than its factorization.

6815247121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40810030.

The product of its digits is 26880, while the sum is 37.

The square root of 6815247121 is about 82554.5099979401. The cubic root of 6815247121 is about 1895.9514088779.

The spelling of 6815247121 in words is "six billion, eight hundred fifteen million, two hundred forty-seven thousand, one hundred twenty-one".