869832209 has 2 divisors, whose sum is σ = 869832210. Its totient is φ = 869832208.

The previous prime is 869832191. The next prime is 869832241. The reversal of 869832209 is 902238968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710062609 + 159769600 = 26647^2 + 12640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869832209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869832269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434916104 + 434916105.

It is an arithmetic number, because the mean of its divisors is an integer number (434916105).

Almost surely, 2^869832209 is an apocalyptic number.

It is an amenable number.

869832209 is a deficient number, since it is larger than the sum of its proper divisors (1).

869832209 is an equidigital number, since it uses as much as digits as its factorization.

869832209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 869832209 is about 29492.9179465173. The cubic root of 869832209 is about 954.5788953251.

The spelling of 869832209 in words is "eight hundred sixty-nine million, eight hundred thirty-two thousand, two hundred nine".