864209000909 has 4 divisors (see below), whose sum is σ = 864221670780. Its totient is φ = 864196331040.

The previous prime is 864209000903. The next prime is 864209000951. The reversal of 864209000909 is 909000902468.

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 179954124100 + 684254876809 = 424210^2 + 827197^2 .

It is a cyclic number.

It is not a de Polignac number, because 864209000909 - 2¹² = 864208996813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864209000903) 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, 6232064 + ... + 6369225.

It is an arithmetic number, because the mean of its divisors is an integer number (216055417695).

Almost surely, 2^864209000909 is an apocalyptic number.

It is an amenable number.

864209000909 is a deficient number, since it is larger than the sum of its proper divisors (12669871).

864209000909 is a wasteful number, since it uses less digits than its factorization.

864209000909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12669870.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 864209000909 in words is "eight hundred sixty-four billion, two hundred nine million, nine hundred nine", and thus it is an aban number.