823881217 has 16 divisors (see below), whose sum is σ = 884822400. Its totient is φ = 764409600.

The previous prime is 823881209. The next prime is 823881259. The reversal of 823881217 is 712188328.

It is a cyclic number.

It is not a de Polignac number, because 823881217 - 2³ = 823881209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 823881217.

It is not an unprimeable number, because it can be changed into a prime (823882217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355659 + ... + 357967.

It is an arithmetic number, because the mean of its divisors is an integer number (55301400).

Almost surely, 2^823881217 is an apocalyptic number.

It is an amenable number.

823881217 is a deficient number, since it is larger than the sum of its proper divisors (60941183).

823881217 is a wasteful number, since it uses less digits than its factorization.

823881217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its digits is 43008, while the sum is 40.

The square root of 823881217 is about 28703.3311133046. The cubic root of 823881217 is about 937.4645787387.

The spelling of 823881217 in words is "eight hundred twenty-three million, eight hundred eighty-one thousand, two hundred seventeen".