1115565 has 16 divisors (see below), whose sum is σ = 1947456. Its totient is φ = 540800.

The previous prime is 1115561. The next prime is 1115567. The reversal of 1115565 is 5655111.

It is not a de Polignac number, because 1115565 - 2² = 1115561 is a prime.

1115565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115561) 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, 3216 + ... + 3545.

It is an arithmetic number, because the mean of its divisors is an integer number (121716).

2^1115565 is an apocalyptic number.

1115565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1115565 is a deficient number, since it is larger than the sum of its proper divisors (831891).

1115565 is a wasteful number, since it uses less digits than its factorization.

1115565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its digits is 750, while the sum is 24.

The square root of 1115565 is about 1056.2031054679. The cubic root of 1115565 is about 103.7126250435.

It can be divided in two parts, 11 and 15565, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 1115565 in words is "one million, one hundred fifteen thousand, five hundred sixty-five".