11521656 has 64 divisors (see below), whose sum is σ = 32810400. Its totient is φ = 3744000.

The previous prime is 11521651. The next prime is 11521661. The reversal of 11521656 is 65612511.

It is a happy number.

11521656 is a `hidden beast` number, since 1 + 1 + 5 + 2 + 1 + 656 = 666.

It is an interprime number because it is at equal distance from previous prime (11521651) and next prime (11521661).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8206 + ... + 9506.

Almost surely, 2^11521656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11521656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16405200).

11521656 is an abundant number, since it is smaller than the sum of its proper divisors (21288744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11521656 is a wasteful number, since it uses less digits than its factorization.

11521656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1347 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 11521656 is about 3394.3564927685. The cubic root of 11521656 is about 225.8594683273.

The spelling of 11521656 in words is "eleven million, five hundred twenty-one thousand, six hundred fifty-six".