11561139 has 48 divisors (see below), whose sum is σ = 19262880. Its totient is φ = 6635520.

The previous prime is 11561117. The next prime is 11561159. The reversal of 11561139 is 93116511.

11561139 is a `hidden beast` number, since 1 + 15 + 611 + 39 = 666.

It is not a de Polignac number, because 11561139 - 2¹⁵ = 11528371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11561159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119139 + ... + 119235.

It is an arithmetic number, because the mean of its divisors is an integer number (401310).

Almost surely, 2^11561139 is an apocalyptic number.

11561139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11561139 is a deficient number, since it is larger than the sum of its proper divisors (7701741).

11561139 is a wasteful number, since it uses less digits than its factorization.

11561139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 177 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 11561139 is about 3400.1674958743. The cubic root of 11561139 is about 226.1171697751.

The spelling of 11561139 in words is "eleven million, five hundred sixty-one thousand, one hundred thirty-nine".