1121645 has 16 divisors (see below), whose sum is σ = 1562880. Its totient is φ = 756864.

The previous prime is 1121629. The next prime is 1121651. The reversal of 1121645 is 5461211.

It is not a de Polignac number, because 1121645 - 2⁴ = 1121629 is a prime.

It is a super-3 number, since 3×1121645³ = 4233382682086233375, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2336 + ... + 2774.

It is an arithmetic number, because the mean of its divisors is an integer number (97680).

2^1121645 is an apocalyptic number.

It is an amenable number.

1121645 is a deficient number, since it is larger than the sum of its proper divisors (441235).

1121645 is an equidigital number, since it uses as much as digits as its factorization.

1121645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 240, while the sum is 20.

The square root of 1121645 is about 1059.0774287086. The cubic root of 1121645 is about 103.9007003368.

Adding to 1121645 its reverse (5461211), we get a palindrome (6582856).

The spelling of 1121645 in words is "one million, one hundred twenty-one thousand, six hundred forty-five".