11987521 has 8 divisors (see below), whose sum is σ = 14753984. Its totient is φ = 9484560.

The previous prime is 11987501. The next prime is 11987579. The reversal of 11987521 is 12578911.

It is a happy number.

11987521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11987521 - 2⁵ = 11987489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11987501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65775 + ... + 65956.

It is an arithmetic number, because the mean of its divisors is an integer number (1844248).

Almost surely, 2^11987521 is an apocalyptic number.

It is an amenable number.

11987521 is a deficient number, since it is larger than the sum of its proper divisors (2766463).

11987521 is a wasteful number, since it uses less digits than its factorization.

11987521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131751.

The product of its digits is 5040, while the sum is 34.

The square root of 11987521 is about 3462.2999581203. The cubic root of 11987521 is about 228.8634604907.

The spelling of 11987521 in words is "eleven million, nine hundred eighty-seven thousand, five hundred twenty-one".