2857648121 has 8 divisors (see below), whose sum is σ = 2936341320. Its totient is φ = 2779031808.

The previous prime is 2857648109. The next prime is 2857648141. The reversal of 2857648121 is 1218467582.

It can be written as a sum of positive squares in 4 ways, for example, as 1093228096 + 1764420025 = 33064^2 + 42005^2 .

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 2857648121 - 2¹⁸ = 2857385977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857648141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60635 + ... + 96911.

It is an arithmetic number, because the mean of its divisors is an integer number (367042665).

Almost surely, 2^2857648121 is an apocalyptic number.

It is an amenable number.

2857648121 is a deficient number, since it is larger than the sum of its proper divisors (78693199).

2857648121 is a wasteful number, since it uses less digits than its factorization.

2857648121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38443.

The product of its digits is 215040, while the sum is 44.

The square root of 2857648121 is about 53456.9744841588. The cubic root of 2857648121 is about 1419.0670524939.

The spelling of 2857648121 in words is "two billion, eight hundred fifty-seven million, six hundred forty-eight thousand, one hundred twenty-one".