987169 has 4 divisors (see below), whose sum is σ = 997444. Its totient is φ = 976896.

The previous prime is 987143. The next prime is 987191. The reversal of 987169 is 961789.

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 547600 + 439569 = 740^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 987169 - 2¹¹ = 985121 is a prime.

It is a super-2 number, since 2×987169² = 1949005269122, which contains 22 as substring.

It is a Duffinian number.

987169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (987199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4992 + ... + 5185.

It is an arithmetic number, because the mean of its divisors is an integer number (249361).

2⁹⁸⁷¹⁶⁹ is an apocalyptic number.

It is an amenable number.

987169 is a deficient number, since it is larger than the sum of its proper divisors (10275).

987169 is a wasteful number, since it uses less digits than its factorization.

987169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10274.

The product of its digits is 27216, while the sum is 40.

The square root of 987169 is about 993.5637875849. The cubic root of 987169 is about 99.5704575748.

It can be divided in two parts, 987 and 169, that added together give a square (1156 = 34²).

The spelling of 987169 in words is "nine hundred eighty-seven thousand, one hundred sixty-nine".