1284991 has 2 divisors, whose sum is σ = 1284992. Its totient is φ = 1284990.

The previous prime is 1284977. The next prime is 1285021. The reversal of 1284991 is 1994821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1284991 - 2⁷ = 1284863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642495 + 642496.

It is an arithmetic number, because the mean of its divisors is an integer number (642496).

2^1284991 is an apocalyptic number.

1284991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284991 is an equidigital number, since it uses as much as digits as its factorization.

1284991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 1284991 is about 1133.5744351387. The cubic root of 1284991 is about 108.7176430799.

The spelling of 1284991 in words is "one million, two hundred eighty-four thousand, nine hundred ninety-one".