869247217 has 2 divisors, whose sum is σ = 869247218. Its totient is φ = 869247216.

The previous prime is 869247209. The next prime is 869247221. The reversal of 869247217 is 712742968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833534641 + 35712576 = 28871^2 + 5976^2 .

It is a cyclic number.

It is not a de Polignac number, because 869247217 - 2³ = 869247209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869247227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434623608 + 434623609.

It is an arithmetic number, because the mean of its divisors is an integer number (434623609).

Almost surely, 2^869247217 is an apocalyptic number.

It is an amenable number.

869247217 is a deficient number, since it is larger than the sum of its proper divisors (1).

869247217 is an equidigital number, since it uses as much as digits as its factorization.

869247217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 869247217 is about 29482.9987789573. The cubic root of 869247217 is about 954.3648516494.

The spelling of 869247217 in words is "eight hundred sixty-nine million, two hundred forty-seven thousand, two hundred seventeen".