1809109813 has 16 divisors (see below), whose sum is σ = 2170788480. Its totient is φ = 1474837056.

The previous prime is 1809109801. The next prime is 1809109817. The reversal of 1809109813 is 3189019081.

It is a happy number.

It is not a de Polignac number, because 1809109813 - 2¹⁷ = 1808978741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809109817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52906 + ... + 80107.

It is an arithmetic number, because the mean of its divisors is an integer number (135674280).

Almost surely, 2^1809109813 is an apocalyptic number.

It is an amenable number.

1809109813 is a deficient number, since it is larger than the sum of its proper divisors (361678667).

1809109813 is a wasteful number, since it uses less digits than its factorization.

1809109813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133116.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1809109813 is about 42533.6315519848. The cubic root of 1809109813 is about 1218.4890847361.

The spelling of 1809109813 in words is "one billion, eight hundred nine million, one hundred nine thousand, eight hundred thirteen".