1115665 has 4 divisors (see below), whose sum is σ = 1338804. Its totient is φ = 892528.

The previous prime is 1115657. The next prime is 1115683. The reversal of 1115665 is 5665111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5665111 = 1889 ⋅2999.

It can be written as a sum of positive squares in 2 ways, for example, as 425104 + 690561 = 652^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115665 - 2³ = 1115657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111562 + ... + 111571.

It is an arithmetic number, because the mean of its divisors is an integer number (334701).

2^1115665 is an apocalyptic number.

It is an amenable number.

1115665 is a deficient number, since it is larger than the sum of its proper divisors (223139).

1115665 is an equidigital number, since it uses as much as digits as its factorization.

1115665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223138.

The product of its digits is 900, while the sum is 25.

The square root of 1115665 is about 1056.2504437869. The cubic root of 1115665 is about 103.7157239075.

It can be divided in two parts, 111 and 5665, that added together give a square (5776 = 76²).

The spelling of 1115665 in words is "one million, one hundred fifteen thousand, six hundred sixty-five".