857142817 has 4 divisors (see below), whose sum is σ = 894409920. Its totient is φ = 819875716.

The previous prime is 857142809. The next prime is 857142833. The reversal of 857142817 is 718241758.

857142817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 857142817 - 2³ = 857142809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857142887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18633517 + ... + 18633562.

It is an arithmetic number, because the mean of its divisors is an integer number (223602480).

Almost surely, 2^857142817 is an apocalyptic number.

It is an amenable number.

857142817 is a deficient number, since it is larger than the sum of its proper divisors (37267103).

857142817 is a wasteful number, since it uses less digits than its factorization.

857142817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37267102.

The product of its digits is 125440, while the sum is 43.

The square root of 857142817 is about 29277.0015028862. The cubic root of 857142817 is about 949.9142367638.

The spelling of 857142817 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred seventeen".