1810109 has 24 divisors (see below), whose sum is σ = 2326968. Its totient is φ = 1397760.

The previous prime is 1810097. The next prime is 1810129. The reversal of 1810109 is 9010181.

It can be written as a sum of positive squares in 4 ways, for example, as 240100 + 1570009 = 490^2 + 1253^2 .

It is not a de Polignac number, because 1810109 - 2⁸ = 1809853 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1810129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34127 + ... + 34179.

It is an arithmetic number, because the mean of its divisors is an integer number (96957).

2^1810109 is an apocalyptic number.

It is an amenable number.

1810109 is a deficient number, since it is larger than the sum of its proper divisors (516859).

1810109 is a wasteful number, since it uses less digits than its factorization.

1810109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1810109 is about 1345.4029136285. The cubic root of 1810109 is about 121.8713370804.

Adding to 1810109 its product of nonzero digits (72), we get a palindrome (1810181).

The spelling of 1810109 in words is "one million, eight hundred ten thousand, one hundred nine".