111365809 has 9 divisors (see below), whose sum is σ = 113879649. Its totient is φ = 108906960.

The previous prime is 111365803. The next prime is 111365899. The reversal of 111365809 is 908563111.

The square root of 111365809 is 10553.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1703025 + 109662784 = 1305^2 + 10472^2 .

It is not a de Polignac number, because 111365809 - 2³ = 111365801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111365801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 643647 + ... + 643819.

Almost surely, 2^111365809 is an apocalyptic number.

111365809 is the 10553-rd square number.

111365809 is the 5277-th centered octagonal number.

It is an amenable number.

111365809 is a deficient number, since it is larger than the sum of its proper divisors (2513840).

111365809 is an frugal number, since it uses more digits than its factorization.

111365809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The cubic root of 111365809 is about 481.1169143663.

The spelling of 111365809 in words is "one hundred eleven million, three hundred sixty-five thousand, eight hundred nine".