1287569 has 2 divisors, whose sum is σ = 1287570. Its totient is φ = 1287568.

The previous prime is 1287553. The next prime is 1287589. The reversal of 1287569 is 9657821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 877969 + 409600 = 937^2 + 640^2 .

It is an emirp because it is prime and its reverse (9657821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287569 - 2⁴ = 1287553 is a prime.

It is a super-2 number, since 2×1287569² = 3315667859522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1287589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643784 + 643785.

It is an arithmetic number, because the mean of its divisors is an integer number (643785).

2^1287569 is an apocalyptic number.

It is an amenable number.

1287569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287569 is an equidigital number, since it uses as much as digits as its factorization.

1287569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 1287569 is about 1134.7109764165. The cubic root of 1287569 is about 108.7902990648.

The spelling of 1287569 in words is "one million, two hundred eighty-seven thousand, five hundred sixty-nine".