1123523521 has 8 divisors (see below), whose sum is σ = 1145819520. Its totient is φ = 1101268272.

The previous prime is 1123523519. The next prime is 1123523581. The reversal of 1123523521 is 1253253211.

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

It is a cyclic number.

It is not a de Polignac number, because 1123523521 - 2¹ = 1123523519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123523501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48850 + ... + 68068.

It is an arithmetic number, because the mean of its divisors is an integer number (143227440).

Almost surely, 2^1123523521 is an apocalyptic number.

It is an amenable number.

1123523521 is a deficient number, since it is larger than the sum of its proper divisors (22295999).

1123523521 is a wasteful number, since it uses less digits than its factorization.

1123523521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20375.

The product of its digits is 1800, while the sum is 25.

The square root of 1123523521 is about 33519.0023867060. The cubic root of 1123523521 is about 1039.5867197278.

Adding to 1123523521 its reverse (1253253211), we get a palindrome (2376776732).

The spelling of 1123523521 in words is "one billion, one hundred twenty-three million, five hundred twenty-three thousand, five hundred twenty-one".