11161287 has 16 divisors (see below), whose sum is σ = 16646880. Its totient is φ = 7390656.

The previous prime is 11161229. The next prime is 11161289. The reversal of 11161287 is 78216111.

It is not a de Polignac number, because 11161287 - 2⁷ = 11161159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 11161287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11161289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923 + ... + 5555.

It is an arithmetic number, because the mean of its divisors is an integer number (1040430).

Almost surely, 2^11161287 is an apocalyptic number.

11161287 is a deficient number, since it is larger than the sum of its proper divisors (5485593).

11161287 is a wasteful number, since it uses less digits than its factorization.

11161287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799 (or 2793 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 11161287 is about 3340.8512388312. The cubic root of 11161287 is about 223.4797062786.

Adding to 11161287 its reverse (78216111), we get a palindrome (89377398).

The spelling of 11161287 in words is "eleven million, one hundred sixty-one thousand, two hundred eighty-seven".