11655521 has 8 divisors (see below), whose sum is σ = 12120864. Its totient is φ = 11198880.

The previous prime is 11655517. The next prime is 11655547. The reversal of 11655521 is 12555611.

11655521 = T₁₀ + T₁₁ + ... + T₄₁₁.

11655521 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 11655521 - 2² = 11655517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11655551) 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, 626 + ... + 4868.

It is an arithmetic number, because the mean of its divisors is an integer number (1515108).

Almost surely, 2^11655521 is an apocalyptic number.

It is an amenable number.

11655521 is a deficient number, since it is larger than the sum of its proper divisors (465343).

11655521 is an equidigital number, since it uses as much as digits as its factorization.

11655521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351.

The product of its digits is 1500, while the sum is 26.

The square root of 11655521 is about 3414.0183069222. The cubic root of 11655521 is about 226.7308226219.

The spelling of 11655521 in words is "eleven million, six hundred fifty-five thousand, five hundred twenty-one".