11555556 has 12 divisors (see below), whose sum is σ = 26962992. Its totient is φ = 3851848.

The previous prime is 11555549. The next prime is 11555587. The reversal of 11555556 is 65555511.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 10.

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, 481470 + ... + 481493.

It is an arithmetic number, because the mean of its divisors is an integer number (2246916).

Almost surely, 2^11555556 is an apocalyptic number.

It is an amenable number.

11555556 is an abundant number, since it is smaller than the sum of its proper divisors (15407436).

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

11555556 is a wasteful number, since it uses less digits than its factorization.

11555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962970 (or 962968 counting only the distinct ones).

The product of its digits is 18750, while the sum is 33.

The square root of 11555556 is about 3399.3464077672. The cubic root of 11555556 is about 226.0807657661.

Subtracting from 11555556 its product of digits (18750), we obtain a triangular number (11536806 = T₄₈₀₃).

It can be divided in two parts, 11 and 555556, that multiplied together give a palindrome (6111116).

The spelling of 11555556 in words is "eleven million, five hundred fifty-five thousand, five hundred fifty-six".