1810609 has 2 divisors, whose sum is σ = 1810610. Its totient is φ = 1810608.

The previous prime is 1810607. The next prime is 1810649. The reversal of 1810609 is 9060181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 107584 = 1305^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810609 - 2¹ = 1810607 is a prime.

Together with 1810607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1810603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905304 + 905305.

It is an arithmetic number, because the mean of its divisors is an integer number (905305).

2^1810609 is an apocalyptic number.

It is an amenable number.

1810609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1810609 is an equidigital number, since it uses as much as digits as its factorization.

1810609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1810609 is about 1345.5887187399. The cubic root of 1810609 is about 121.8825574099.

The spelling of 1810609 in words is "one million, eight hundred ten thousand, six hundred nine".