858489343209 has 9 divisors (see below), whose sum is σ = 1240044177463. Its totient is φ = 572324375712.

The previous prime is 858489343183. The next prime is 858489343213. The reversal of 858489343209 is 902343984858.

The square root of 858489343209 is 926547.

It is a perfect power (a square), and thus also a powerful number.

858489343209 is a `hidden beast` number, since 8 + 5 + 8 + 4 + 89 + 343 + 209 = 666.

It can be written as a sum of positive squares in only one way, i.e., 364336581609 + 494152761600 = 603603^2 + 702960^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 858489343209 - 2⁷ = 858489343081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858489343259) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2625217 + ... + 2934065.

Almost surely, 2^858489343209 is an apocalyptic number.

858489343209 is the 926547-th square number.

858489343209 is the 463274-th centered octagonal number.

It is an amenable number.

858489343209 is a deficient number, since it is larger than the sum of its proper divisors (381554834254).

858489343209 is an frugal number, since it uses more digits than its factorization.

858489343209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617704 (or 308852 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 858489343209 in words is "eight hundred fifty-eight billion, four hundred eighty-nine million, three hundred forty-three thousand, two hundred nine".