861169 has 8 divisors (see below), whose sum is σ = 920160. Its totient is φ = 803136.

The previous prime is 861167. The next prime is 861191. The reversal of 861169 is 961168.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861169 - 2¹ = 861167 is a prime.

It is a super-2 number, since 2×861169² = 1483224093122, which contains 22 as substring.

It is a Duffinian number.

861169 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 861169.

It is not an unprimeable number, because it can be changed into a prime (861163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2902 + ... + 3184.

It is an arithmetic number, because the mean of its divisors is an integer number (115020).

2⁸⁶¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

861169 is a deficient number, since it is larger than the sum of its proper divisors (58991).

861169 is a wasteful number, since it uses less digits than its factorization.

861169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 2592, while the sum is 31.

The square root of 861169 is about 927.9919180683. The cubic root of 861169 is about 95.1399230802.

Subtracting 861169 from its reverse (961168), we obtain a palindrome (99999).

The spelling of 861169 in words is "eight hundred sixty-one thousand, one hundred sixty-nine".