11855513 has 4 divisors (see below), whose sum is σ = 11904948. Its totient is φ = 11806080.

The previous prime is 11855507. The next prime is 11855521. The reversal of 11855513 is 31555811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7907344 + 3948169 = 2812^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 11855513 - 2¹⁰ = 11854489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11855593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24356 + ... + 24837.

It is an arithmetic number, because the mean of its divisors is an integer number (2976237).

Almost surely, 2^11855513 is an apocalyptic number.

It is an amenable number.

11855513 is a deficient number, since it is larger than the sum of its proper divisors (49435).

11855513 is an equidigital number, since it uses as much as digits as its factorization.

11855513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49434.

The product of its digits is 3000, while the sum is 29.

The square root of 11855513 is about 3443.1835559552. The cubic root of 11855513 is about 228.0202672555.

The spelling of 11855513 in words is "eleven million, eight hundred fifty-five thousand, five hundred thirteen".