851841857 has 2 divisors, whose sum is σ = 851841858. Its totient is φ = 851841856.

The previous prime is 851841701. The next prime is 851841889. The reversal of 851841857 is 758148158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619462321 + 232379536 = 24889^2 + 15244^2 .

It is a cyclic number.

It is not a de Polignac number, because 851841857 - 2¹⁰ = 851840833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856841857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425920928 + 425920929.

It is an arithmetic number, because the mean of its divisors is an integer number (425920929).

Almost surely, 2^851841857 is an apocalyptic number.

It is an amenable number.

851841857 is a deficient number, since it is larger than the sum of its proper divisors (1).

851841857 is an equidigital number, since it uses as much as digits as its factorization.

851841857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 358400, while the sum is 47.

The square root of 851841857 is about 29186.3299679833. The cubic root of 851841857 is about 947.9519524540.

The spelling of 851841857 in words is "eight hundred fifty-one million, eight hundred forty-one thousand, eight hundred fifty-seven".