855257771 has 4 divisors (see below), whose sum is σ = 856139544. Its totient is φ = 854376000.

The previous prime is 855257723. The next prime is 855257779. The reversal of 855257771 is 177752558.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855257771 - 2¹⁸ = 854995627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855257779) 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 in 3 ways as a sum of consecutive naturals, for example, 439430 + ... + 441371.

It is an arithmetic number, because the mean of its divisors is an integer number (214034886).

Almost surely, 2^855257771 is an apocalyptic number.

855257771 is a deficient number, since it is larger than the sum of its proper divisors (881773).

855257771 is an equidigital number, since it uses as much as digits as its factorization.

855257771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881772.

The product of its digits is 686000, while the sum is 47.

The square root of 855257771 is about 29244.7904933511. The cubic root of 855257771 is about 949.2173687243.

The spelling of 855257771 in words is "eight hundred fifty-five million, two hundred fifty-seven thousand, seven hundred seventy-one".