1285649 has 2 divisors, whose sum is σ = 1285650. Its totient is φ = 1285648.

The previous prime is 1285633. The next prime is 1285679. The reversal of 1285649 is 9465821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1281424 + 4225 = 1132^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285649 - 2⁴ = 1285633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1285619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642824 + 642825.

It is an arithmetic number, because the mean of its divisors is an integer number (642825).

2^1285649 is an apocalyptic number.

It is an amenable number.

1285649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285649 is an equidigital number, since it uses as much as digits as its factorization.

1285649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 1285649 is about 1133.8646303682. The cubic root of 1285649 is about 108.7361967772.

The spelling of 1285649 in words is "one million, two hundred eighty-five thousand, six hundred forty-nine".