1600649 has 2 divisors, whose sum is σ = 1600650. Its totient is φ = 1600648.

The previous prime is 1600637. The next prime is 1600663. The reversal of 1600649 is 9460061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1281424 + 319225 = 1132^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1600649 - 2⁴ = 1600633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1600699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800324 + 800325.

It is an arithmetic number, because the mean of its divisors is an integer number (800325).

2^1600649 is an apocalyptic number.

It is an amenable number.

1600649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1600649 is an equidigital number, since it uses as much as digits as its factorization.

1600649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1600649 is about 1265.1675778331. The cubic root of 1600649 is about 116.9765214534.

The spelling of 1600649 in words is "one million, six hundred thousand, six hundred forty-nine".