857085851 has 4 divisors (see below), whose sum is σ = 857250000. Its totient is φ = 856921704.

The previous prime is 857085841. The next prime is 857085881. The reversal of 857085851 is 158580758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 857085851 - 2¹⁸ = 856823707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857085796 and 857085805.

It is not an unprimeable number, because it can be changed into a prime (857085841) 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, 73976 + ... + 84773.

It is an arithmetic number, because the mean of its divisors is an integer number (214312500).

Almost surely, 2^857085851 is an apocalyptic number.

857085851 is a deficient number, since it is larger than the sum of its proper divisors (164149).

857085851 is a wasteful number, since it uses less digits than its factorization.

857085851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164148.

The product of its (nonzero) digits is 448000, while the sum is 47.

The square root of 857085851 is about 29276.0286070362. The cubic root of 857085851 is about 949.8931924243.

The spelling of 857085851 in words is "eight hundred fifty-seven million, eighty-five thousand, eight hundred fifty-one".