1121653 has 6 divisors (see below), whose sum is σ = 1214754. Its totient is φ = 1035216.

The previous prime is 1121651. The next prime is 1121671. The reversal of 1121653 is 3561211.

It can be written as a sum of positive squares in 3 ways, for example, as 117649 + 1004004 = 343^2 + 1002^2 .

It is not a de Polignac number, because 1121653 - 2¹ = 1121651 is a prime.

It is a Duffinian number.

1121653 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121651) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3150 + ... + 3487.

It is an arithmetic number, because the mean of its divisors is an integer number (202459).

2^1121653 is an apocalyptic number.

1121653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1121653 is a deficient number, since it is larger than the sum of its proper divisors (93101).

1121653 is an equidigital number, since it uses as much as digits as its factorization.

1121653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6663 (or 6650 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 1121653 is about 1059.0812055740. The cubic root of 1121653 is about 103.9009473560.

Adding to 1121653 its reverse (3561211), we get a palindrome (4682864).

It can be divided in two parts, 112 and 1653, that multiplied together give a triangular number (185136 = T₆₀₈).

The spelling of 1121653 in words is "one million, one hundred twenty-one thousand, six hundred fifty-three".