11855521 has 2 divisors, whose sum is σ = 11855522. Its totient is φ = 11855520.

The previous prime is 11855507. The next prime is 11855531. The reversal of 11855521 is 12555811.

11855521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8381025 + 3474496 = 2895^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 11855521 - 2⁵ = 11855489 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11855521.

It is not a weakly prime, because it can be changed into another prime (11855531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927760 + 5927761.

It is an arithmetic number, because the mean of its divisors is an integer number (5927761).

Almost surely, 2^11855521 is an apocalyptic number.

It is an amenable number.

11855521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11855521 is an equidigital number, since it uses as much as digits as its factorization.

11855521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 28.

The square root of 11855521 is about 3443.1847176705. The cubic root of 11855521 is about 228.0203185442.

The spelling of 11855521 in words is "eleven million, eight hundred fifty-five thousand, five hundred twenty-one".