1288697 has 2 divisors, whose sum is σ = 1288698. Its totient is φ = 1288696.

The previous prime is 1288691. The next prime is 1288699. The reversal of 1288697 is 7968821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674041 + 614656 = 821^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288697 - 2¹² = 1284601 is a prime.

It is a super-6 number, since 6×1288697⁶ (a number of 38 digits) contains 666666 as substring.

Together with 1288699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1288691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644348 + 644349.

It is an arithmetic number, because the mean of its divisors is an integer number (644349).

2^1288697 is an apocalyptic number.

It is an amenable number.

1288697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288697 is an equidigital number, since it uses as much as digits as its factorization.

1288697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 1288697 is about 1135.2079104728. The cubic root of 1288697 is about 108.8220590815.

The spelling of 1288697 in words is "one million, two hundred eighty-eight thousand, six hundred ninety-seven".