2856121 has 2 divisors, whose sum is σ = 2856122. Its totient is φ = 2856120.

The previous prime is 2856107. The next prime is 2856149. The reversal of 2856121 is 1216582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 1071225 = 1336^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2856121 - 2¹¹ = 2854073 is a prime.

2856121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2856421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428060 + 1428061.

It is an arithmetic number, because the mean of its divisors is an integer number (1428061).

2^2856121 is an apocalyptic number.

It is an amenable number.

2856121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856121 is an equidigital number, since it uses as much as digits as its factorization.

2856121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 2856121 is about 1690.0062130063. The cubic root of 2856121 is about 141.8814225326.

It can be divided in two parts, 28561 and 21, that added together give a palindrome (28582).

The spelling of 2856121 in words is "two million, eight hundred fifty-six thousand, one hundred twenty-one".