11561055 has 16 divisors (see below), whose sum is σ = 20179584. Its totient is φ = 5605280.

The previous prime is 11561027. The next prime is 11561087. The reversal of 11561055 is 55016511.

11561055 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11561055 - 2¹⁷ = 11429983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34869 + ... + 35198.

It is an arithmetic number, because the mean of its divisors is an integer number (1261224).

Almost surely, 2^11561055 is an apocalyptic number.

11561055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11561055 is a deficient number, since it is larger than the sum of its proper divisors (8618529).

11561055 is a wasteful number, since it uses less digits than its factorization.

11561055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70086.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 11561055 is about 3400.1551435192. The cubic root of 11561055 is about 226.1166221391.

Adding to 11561055 its reverse (55016511), we get a palindrome (66577566).

It can be divided in two parts, 1156 and 1055, that added together give a triangular number (2211 = T₆₆).

The spelling of 11561055 in words is "eleven million, five hundred sixty-one thousand, fifty-five".