6861576121 has 4 divisors (see below), whose sum is σ = 6873635700. Its totient is φ = 6849516544.

The previous prime is 6861576083. The next prime is 6861576143. The reversal of 6861576121 is 1216751686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216751686 = 2 ⋅608375843.

It can be written as a sum of positive squares in 2 ways, for example, as 4705274025 + 2156302096 = 68595^2 + 46436^2 .

It is a cyclic number.

It is not a de Polignac number, because 6861576121 - 2¹¹ = 6861574073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6861576721) 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, 6028936 + ... + 6030073.

It is an arithmetic number, because the mean of its divisors is an integer number (1718408925).

Almost surely, 2^6861576121 is an apocalyptic number.

It is an amenable number.

6861576121 is a deficient number, since it is larger than the sum of its proper divisors (12059579).

6861576121 is a wasteful number, since it uses less digits than its factorization.

6861576121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059578.

The product of its digits is 120960, while the sum is 43.

The square root of 6861576121 is about 82834.6311695779. The cubic root of 6861576121 is about 1900.2378392015.

The spelling of 6861576121 in words is "six billion, eight hundred sixty-one million, five hundred seventy-six thousand, one hundred twenty-one".