8101809 has 32 divisors (see below), whose sum is σ = 13392000. Its totient is φ = 4810752.

The previous prime is 8101801. The next prime is 8101811. The reversal of 8101809 is 9081018.

It is not a de Polignac number, because 8101809 - 2³ = 8101801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8101801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8257 + ... + 9185.

It is an arithmetic number, because the mean of its divisors is an integer number (418500).

Almost surely, 2^8101809 is an apocalyptic number.

It is an amenable number.

8101809 is a deficient number, since it is larger than the sum of its proper divisors (5290191).

8101809 is a wasteful number, since it uses less digits than its factorization.

8101809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 8101809 is about 2846.3676853140. The cubic root of 8101809 is about 200.8448345810.

The spelling of 8101809 in words is "eight million, one hundred one thousand, eight hundred nine".