855443257 has 2 divisors, whose sum is σ = 855443258. Its totient is φ = 855443256.

The previous prime is 855443191. The next prime is 855443297. The reversal of 855443257 is 752344558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588741696 + 266701561 = 24264^2 + 16331^2 .

It is a cyclic number.

It is not a de Polignac number, because 855443257 - 2⁷ = 855443129 is a prime.

It is not a weakly prime, because it can be changed into another prime (855443297) 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, 427721628 + 427721629.

It is an arithmetic number, because the mean of its divisors is an integer number (427721629).

Almost surely, 2^855443257 is an apocalyptic number.

It is an amenable number.

855443257 is a deficient number, since it is larger than the sum of its proper divisors (1).

855443257 is an equidigital number, since it uses as much as digits as its factorization.

855443257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672000, while the sum is 43.

The square root of 855443257 is about 29247.9615870918. The cubic root of 855443257 is about 949.2859849988.

The spelling of 855443257 in words is "eight hundred fifty-five million, four hundred forty-three thousand, two hundred fifty-seven".