1287169 has 4 divisors (see below), whose sum is σ = 1386196. Its totient is φ = 1188144.

The previous prime is 1287163. The next prime is 1287173. The reversal of 1287169 is 9617821.

It is a happy number.

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 50625 + 1236544 = 225^2 + 1112^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287169 - 2⁹ = 1286657 is a prime.

It is a super-2 number, since 2×1287169² = 3313608069122, which contains 22 as substring.

It is a Duffinian number.

1287169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1287163) 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, 49494 + ... + 49519.

It is an arithmetic number, because the mean of its divisors is an integer number (346549).

2^1287169 is an apocalyptic number.

It is an amenable number.

1287169 is a deficient number, since it is larger than the sum of its proper divisors (99027).

1287169 is an equidigital number, since it uses as much as digits as its factorization.

1287169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99026.

The product of its digits is 6048, while the sum is 34.

The square root of 1287169 is about 1134.5347063885. The cubic root of 1287169 is about 108.7790321924.

The spelling of 1287169 in words is "one million, two hundred eighty-seven thousand, one hundred sixty-nine".