1121565 has 8 divisors (see below), whose sum is σ = 1794528. Its totient is φ = 598160.

The previous prime is 1121557. The next prime is 1121599. The reversal of 1121565 is 5651211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1121565 - 2³ = 1121557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37371 + ... + 37400.

It is an arithmetic number, because the mean of its divisors is an integer number (224316).

2^1121565 is an apocalyptic number.

1121565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121565 is a deficient number, since it is larger than the sum of its proper divisors (672963).

1121565 is an equidigital number, since it uses as much as digits as its factorization.

1121565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74779.

The product of its digits is 300, while the sum is 21.

The square root of 1121565 is about 1059.0396593140. The cubic root of 1121565 is about 103.8982300799.

Adding to 1121565 its reverse (5651211), we get a palindrome (6772776).

The spelling of 1121565 in words is "one million, one hundred twenty-one thousand, five hundred sixty-five".