1288997 has 2 divisors, whose sum is σ = 1288998. Its totient is φ = 1288996.

The previous prime is 1288993. The next prime is 1289003. The reversal of 1288997 is 7998821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982081 + 306916 = 991^2 + 554^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288997 - 2² = 1288993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288993) 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 as a sum of consecutive naturals, namely, 644498 + 644499.

It is an arithmetic number, because the mean of its divisors is an integer number (644499).

2^1288997 is an apocalyptic number.

It is an amenable number.

1288997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288997 is an equidigital number, since it uses as much as digits as its factorization.

1288997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 1288997 is about 1135.3400371695. The cubic root of 1288997 is about 108.8305027743.

The spelling of 1288997 in words is "one million, two hundred eighty-eight thousand, nine hundred ninety-seven".