869604979169 has 4 divisors (see below), whose sum is σ = 869814173844. Its totient is φ = 869395784496.

The previous prime is 869604979097. The next prime is 869604979193. The reversal of 869604979169 is 961979406968.

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 222043576225 + 647561402944 = 471215^2 + 804712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869604979169 is a prime.

It is a super-2 number, since 2×869604979169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 869604979096 and 869604979105.

It is not an unprimeable number, because it can be changed into a prime (869604979769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104591102 + ... + 104599415.

It is an arithmetic number, because the mean of its divisors is an integer number (217453543461).

Almost surely, 2^869604979169 is an apocalyptic number.

It is an amenable number.

869604979169 is a deficient number, since it is larger than the sum of its proper divisors (209194675).

869604979169 is a wasteful number, since it uses less digits than its factorization.

869604979169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209194674.

The product of its (nonzero) digits is 317447424, while the sum is 74.

The spelling of 869604979169 in words is "eight hundred sixty-nine billion, six hundred four million, nine hundred seventy-nine thousand, one hundred sixty-nine".