857319497 has 2 divisors, whose sum is σ = 857319498. Its totient is φ = 857319496.

The previous prime is 857319487. The next prime is 857319517. The reversal of 857319497 is 794913758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 849372736 + 7946761 = 29144^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 857319497 - 2⁴ = 857319481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857319427) 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, 428659748 + 428659749.

It is an arithmetic number, because the mean of its divisors is an integer number (428659749).

Almost surely, 2^857319497 is an apocalyptic number.

It is an amenable number.

857319497 is a deficient number, since it is larger than the sum of its proper divisors (1).

857319497 is an equidigital number, since it uses as much as digits as its factorization.

857319497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 53.

The square root of 857319497 is about 29280.0187329175. The cubic root of 857319497 is about 949.9794998346.

The spelling of 857319497 in words is "eight hundred fifty-seven million, three hundred nineteen thousand, four hundred ninety-seven".