855728791 has 2 divisors, whose sum is σ = 855728792. Its totient is φ = 855728790.

The previous prime is 855728759. The next prime is 855728837. The reversal of 855728791 is 197827558.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855728791 - 2⁵ = 855728759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855720791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427864395 + 427864396.

It is an arithmetic number, because the mean of its divisors is an integer number (427864396).

Almost surely, 2^855728791 is an apocalyptic number.

855728791 is a deficient number, since it is larger than the sum of its proper divisors (1).

855728791 is an equidigital number, since it uses as much as digits as its factorization.

855728791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 52.

The square root of 855728791 is about 29252.8424430858. The cubic root of 855728791 is about 949.3915923433.

The spelling of 855728791 in words is "eight hundred fifty-five million, seven hundred twenty-eight thousand, seven hundred ninety-one".