857280791 has 2 divisors, whose sum is σ = 857280792. Its totient is φ = 857280790.

The previous prime is 857280761. The next prime is 857280793. The reversal of 857280791 is 197082758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857280791 - 2¹⁰ = 857279767 is a prime.

Together with 857280793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857280793) 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, 428640395 + 428640396.

It is an arithmetic number, because the mean of its divisors is an integer number (428640396).

Almost surely, 2^857280791 is an apocalyptic number.

857280791 is a deficient number, since it is larger than the sum of its proper divisors (1).

857280791 is an equidigital number, since it uses as much as digits as its factorization.

857280791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 857280791 is about 29279.3577627652. The cubic root of 857280791 is about 949.9652031576.

The spelling of 857280791 in words is "eight hundred fifty-seven million, two hundred eighty thousand, seven hundred ninety-one".