11557855 has 4 divisors (see below), whose sum is σ = 13869432. Its totient is φ = 9246280.

The previous prime is 11557837. The next prime is 11557873. The reversal of 11557855 is 55875511.

11557855 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (11557837) and next prime (11557873).

It is not a de Polignac number, because 11557855 - 2¹⁹ = 11033567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155781 + ... + 1155790.

It is an arithmetic number, because the mean of its divisors is an integer number (3467358).

Almost surely, 2^11557855 is an apocalyptic number.

11557855 is a deficient number, since it is larger than the sum of its proper divisors (2311577).

11557855 is an equidigital number, since it uses as much as digits as its factorization.

11557855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311576.

The product of its digits is 35000, while the sum is 37.

The square root of 11557855 is about 3399.6845441894. The cubic root of 11557855 is about 226.0957578390.

It can be divided in two parts, 11557 and 855, that multiplied together give a triangular number (9881235 = T₄₄₄₅).

The spelling of 11557855 in words is "eleven million, five hundred fifty-seven thousand, eight hundred fifty-five".