11889503521 has 27 divisors (see below), whose sum is σ = 14248394937. Its totient is φ = 9892018080.

The previous prime is 11889503513. The next prime is 11889503533. The reversal of 11889503521 is 12530598811.

The square root of 11889503521 is 109039.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 793830625 + 11095672896 = 28175^2 + 105336^2 .

It is not a de Polignac number, because 11889503521 - 2³ = 11889503513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11889500521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28240891 + ... + 28241311.

It is an arithmetic number, because the mean of its divisors is an integer number (527718331).

Almost surely, 2^11889503521 is an apocalyptic number.

11889503521 is the 109039-th square number.

11889503521 is the 54520-th centered octagonal number.

It is an amenable number.

11889503521 is a deficient number, since it is larger than the sum of its proper divisors (2358891416).

11889503521 is an frugal number, since it uses more digits than its factorization.

11889503521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 11889503521 in words is "eleven billion, eight hundred eighty-nine million, five hundred three thousand, five hundred twenty-one".