858206009 has 4 divisors (see below), whose sum is σ = 881400804. Its totient is φ = 835011216.

The previous prime is 858205987. The next prime is 858206017. The reversal of 858206009 is 900602858.

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

It can be written as a sum of positive squares in 2 ways, for example, as 704371600 + 153834409 = 26540^2 + 12403^2 .

It is a cyclic number.

It is not a de Polignac number, because 858206009 - 2¹² = 858201913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858206059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11597342 + ... + 11597415.

It is an arithmetic number, because the mean of its divisors is an integer number (220350201).

Almost surely, 2^858206009 is an apocalyptic number.

It is an amenable number.

858206009 is a deficient number, since it is larger than the sum of its proper divisors (23194795).

858206009 is a wasteful number, since it uses less digits than its factorization.

858206009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23194794.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 858206009 is about 29295.1533363456. The cubic root of 858206009 is about 950.3068294219.

The spelling of 858206009 in words is "eight hundred fifty-eight million, two hundred six thousand, nine".