1099649 has 2 divisors, whose sum is σ = 1099650. Its totient is φ = 1099648.

The previous prime is 1099633. The next prime is 1099669. The reversal of 1099649 is 9469901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 547600 = 743^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099649 - 2⁴ = 1099633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1099619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549824 + 549825.

It is an arithmetic number, because the mean of its divisors is an integer number (549825).

2^1099649 is an apocalyptic number.

It is an amenable number.

1099649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099649 is an equidigital number, since it uses as much as digits as its factorization.

1099649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1099649 is about 1048.6415021350. The cubic root of 1099649 is about 103.2170306709.

The spelling of 1099649 in words is "one million, ninety-nine thousand, six hundred forty-nine".