857943617 has 2 divisors, whose sum is σ = 857943618. Its totient is φ = 857943616.

The previous prime is 857943551. The next prime is 857943673. The reversal of 857943617 is 716349758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459502096 + 398441521 = 21436^2 + 19961^2 .

It is a cyclic number.

It is not a de Polignac number, because 857943617 - 2¹⁴ = 857927233 is a prime.

It is not a weakly prime, because it can be changed into another prime (857943017) 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, 428971808 + 428971809.

It is an arithmetic number, because the mean of its divisors is an integer number (428971809).

Almost surely, 2^857943617 is an apocalyptic number.

It is an amenable number.

857943617 is a deficient number, since it is larger than the sum of its proper divisors (1).

857943617 is an equidigital number, since it uses as much as digits as its factorization.

857943617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 857943617 is about 29290.6745740005. The cubic root of 857943617 is about 950.2099691017.

The spelling of 857943617 in words is "eight hundred fifty-seven million, nine hundred forty-three thousand, six hundred seventeen".