1810649 has 2 divisors, whose sum is σ = 1810650. Its totient is φ = 1810648.

The previous prime is 1810609. The next prime is 1810667. The reversal of 1810649 is 9460181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1708249 + 102400 = 1307^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810649 - 2¹⁶ = 1745113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1810609) 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, 905324 + 905325.

It is an arithmetic number, because the mean of its divisors is an integer number (905325).

2^1810649 is an apocalyptic number.

It is an amenable number.

1810649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1810649 is an equidigital number, since it uses as much as digits as its factorization.

1810649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1810649 is about 1345.6035820404. The cubic root of 1810649 is about 121.8834549471.

The spelling of 1810649 in words is "one million, eight hundred ten thousand, six hundred forty-nine".