857316557 has 2 divisors, whose sum is σ = 857316558. Its totient is φ = 857316556.

The previous prime is 857316553. The next prime is 857316623. The reversal of 857316557 is 755613758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685863721 + 171452836 = 26189^2 + 13094^2 .

It is a cyclic number.

It is not a de Polignac number, because 857316557 - 2² = 857316553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857316553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428658278 + 428658279.

It is an arithmetic number, because the mean of its divisors is an integer number (428658279).

Almost surely, 2^857316557 is an apocalyptic number.

It is an amenable number.

857316557 is a deficient number, since it is larger than the sum of its proper divisors (1).

857316557 is an equidigital number, since it uses as much as digits as its factorization.

857316557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 47.

The square root of 857316557 is about 29279.9685279886. The cubic root of 857316557 is about 949.9784139140.

The spelling of 857316557 in words is "eight hundred fifty-seven million, three hundred sixteen thousand, five hundred fifty-seven".