823909085 has 4 divisors (see below), whose sum is σ = 988690908. Its totient is φ = 659127264.

The previous prime is 823909069. The next prime is 823909123. The reversal of 823909085 is 580909328.

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 230402041 + 593507044 = 15179^2 + 24362^2 .

It is a cyclic number.

It is not a de Polignac number, because 823909085 - 2⁴ = 823909069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82390904 + ... + 82390913.

It is an arithmetic number, because the mean of its divisors is an integer number (247172727).

Almost surely, 2^823909085 is an apocalyptic number.

It is an amenable number.

823909085 is a deficient number, since it is larger than the sum of its proper divisors (164781823).

823909085 is a wasteful number, since it uses less digits than its factorization.

823909085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164781822.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 823909085 is about 28703.8165580816. The cubic root of 823909085 is about 937.4751486153.

The spelling of 823909085 in words is "eight hundred twenty-three million, nine hundred nine thousand, eighty-five".