2851656221 has 2 divisors, whose sum is σ = 2851656222. Its totient is φ = 2851656220.

The previous prime is 2851656169. The next prime is 2851656271. The reversal of 2851656221 is 1226561582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1763580025 + 1088076196 = 41995^2 + 32986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2851656221 - 2¹⁰ = 2851655197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2851656271) 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 as a sum of consecutive naturals, namely, 1425828110 + 1425828111.

It is an arithmetic number, because the mean of its divisors is an integer number (1425828111).

Almost surely, 2^2851656221 is an apocalyptic number.

It is an amenable number.

2851656221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2851656221 is an equidigital number, since it uses as much as digits as its factorization.

2851656221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 38.

The square root of 2851656221 is about 53400.9009380928. The cubic root of 2851656221 is about 1418.0745279430.

The spelling of 2851656221 in words is "two billion, eight hundred fifty-one million, six hundred fifty-six thousand, two hundred twenty-one".