857085997 has 2 divisors, whose sum is σ = 857085998. Its totient is φ = 857085996.

The previous prime is 857085973. The next prime is 857086001. The reversal of 857085997 is 799580758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 452030121 + 405055876 = 21261^2 + 20126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857085997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857085907) 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, 428542998 + 428542999.

It is an arithmetic number, because the mean of its divisors is an integer number (428542999).

Almost surely, 2^857085997 is an apocalyptic number.

It is an amenable number.

857085997 is a deficient number, since it is larger than the sum of its proper divisors (1).

857085997 is an equidigital number, since it uses as much as digits as its factorization.

857085997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 58.

The square root of 857085997 is about 29276.0311005437. The cubic root of 857085997 is about 949.8932463607.

The spelling of 857085997 in words is "eight hundred fifty-seven million, eighty-five thousand, nine hundred ninety-seven".