11561187 has 12 divisors (see below), whose sum is σ = 16944200. Its totient is φ = 7006560.

The previous prime is 11561161. The next prime is 11561197. The reversal of 11561187 is 78116511.

It is not a de Polignac number, because 11561187 - 2⁸ = 11560931 is a prime.

It is a super-2 number, since 2×11561187² = 267322089697938, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561117) 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 11 ways as a sum of consecutive naturals, for example, 15562 + ... + 16287.

Almost surely, 2^11561187 is an apocalyptic number.

11561187 is a deficient number, since it is larger than the sum of its proper divisors (5383013).

11561187 is a wasteful number, since it uses less digits than its factorization.

11561187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31874 (or 31863 counting only the distinct ones).

The product of its digits is 1680, while the sum is 30.

The square root of 11561187 is about 3400.1745543428. The cubic root of 11561187 is about 226.1174827087.

Adding to 11561187 its reverse (78116511), we get a palindrome (89677698).

The spelling of 11561187 in words is "eleven million, five hundred sixty-one thousand, one hundred eighty-seven".