1121663 has 4 divisors (see below), whose sum is σ = 1124760. Its totient is φ = 1118568.

The previous prime is 1121651. The next prime is 1121671. The reversal of 1121663 is 3661211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121663 - 2⁶ = 1121599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (281190).

2^1121663 is an apocalyptic number.

1121663 is a deficient number, since it is larger than the sum of its proper divisors (3097).

1121663 is an equidigital number, since it uses as much as digits as its factorization.

1121663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096.

The product of its digits is 216, while the sum is 20.

The square root of 1121663 is about 1059.0859266367. The cubic root of 1121663 is about 103.9012561284.

Adding to 1121663 its reverse (3661211), we get a palindrome (4782874).

The spelling of 1121663 in words is "one million, one hundred twenty-one thousand, six hundred sixty-three".