869906217 has 4 divisors (see below), whose sum is σ = 1159874960. Its totient is φ = 579937476.

The previous prime is 869906171. The next prime is 869906227. The reversal of 869906217 is 712609968.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 869906217 - 2⁶ = 869906153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869906227) 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, 144984367 + ... + 144984372.

It is an arithmetic number, because the mean of its divisors is an integer number (289968740).

Almost surely, 2^869906217 is an apocalyptic number.

It is an amenable number.

869906217 is a deficient number, since it is larger than the sum of its proper divisors (289968743).

869906217 is a wasteful number, since it uses less digits than its factorization.

869906217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289968742.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 869906217 is about 29494.1725939210. The cubic root of 869906217 is about 954.6059673936.

The spelling of 869906217 in words is "eight hundred sixty-nine million, nine hundred six thousand, two hundred seventeen".