810000111 has 4 divisors (see below), whose sum is σ = 1080000152. Its totient is φ = 540000072.

The previous prime is 810000109. The next prime is 810000119. The reversal of 810000111 is 111000018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 810000111 - 2¹ = 810000109 is a prime.

It is a super-2 number, since 2×810000111² = 1312200359640024642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810000119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135000016 + ... + 135000021.

It is an arithmetic number, because the mean of its divisors is an integer number (270000038).

Almost surely, 2^810000111 is an apocalyptic number.

810000111 is a deficient number, since it is larger than the sum of its proper divisors (270000041).

810000111 is a wasteful number, since it uses less digits than its factorization.

810000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270000040.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 810000111 is about 28460.5008915866. The cubic root of 810000111 is about 932.1697943667.

Adding to 810000111 its reverse (111000018), we get a palindrome (921000129).

The spelling of 810000111 in words is "eight hundred ten million, one hundred eleven", and thus it is an aban number.