857559971 has 4 divisors (see below), whose sum is σ = 857673000. Its totient is φ = 857446944.

The previous prime is 857559961. The next prime is 857559973. The reversal of 857559971 is 179955758.

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 857559971 - 2⁶ = 857559907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857559973) 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, 44246 + ... + 60603.

It is an arithmetic number, because the mean of its divisors is an integer number (214418250).

Almost surely, 2^857559971 is an apocalyptic number.

857559971 is a deficient number, since it is larger than the sum of its proper divisors (113029).

857559971 is a wasteful number, since it uses less digits than its factorization.

857559971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113028.

The product of its digits is 3969000, while the sum is 56.

The square root of 857559971 is about 29284.1248972886. The cubic root of 857559971 is about 950.0683130931.

The spelling of 857559971 in words is "eight hundred fifty-seven million, five hundred fifty-nine thousand, nine hundred seventy-one".