1123621653 has 32 divisors (see below), whose sum is σ = 1880266752. Its totient is φ = 579816000.

The previous prime is 1123621637. The next prime is 1123621663. The reversal of 1123621653 is 3561263211.

It is not a de Polignac number, because 1123621653 - 2⁴ = 1123621637 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123621653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123621663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18775 + ... + 50987.

It is an arithmetic number, because the mean of its divisors is an integer number (58758336).

Almost surely, 2^1123621653 is an apocalyptic number.

It is an amenable number.

1123621653 is a deficient number, since it is larger than the sum of its proper divisors (756645099).

1123621653 is a wasteful number, since it uses less digits than its factorization.

1123621653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32385.

The product of its digits is 6480, while the sum is 30.

The square root of 1123621653 is about 33520.4661811258. The cubic root of 1123621653 is about 1039.6169857472.

Adding to 1123621653 its reverse (3561263211), we get a palindrome (4684884864).

The spelling of 1123621653 in words is "one billion, one hundred twenty-three million, six hundred twenty-one thousand, six hundred fifty-three".