11881111 has 12 divisors (see below), whose sum is σ = 13167000. Its totient is φ = 10712240.

The previous prime is 11881057. The next prime is 11881117. The reversal of 11881111 is 11118811.

It is not a de Polignac number, because 11881111 - 2⁷ = 11880983 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11881117) 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 11 ways as a sum of consecutive naturals, for example, 17700 + ... + 18358.

It is an arithmetic number, because the mean of its divisors is an integer number (1097250).

Almost surely, 2^11881111 is an apocalyptic number.

11881111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11881111 is the 1542-nd centered decagonal number.

11881111 is a deficient number, since it is larger than the sum of its proper divisors (1285889).

11881111 is a wasteful number, since it uses less digits than its factorization.

11881111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 819 counting only the distinct ones).

The product of its digits is 64, while the sum is 22.

The square root of 11881111 is about 3446.8987510514. The cubic root of 11881111 is about 228.1842603536.

Adding to 11881111 its reverse (11118811), we get a palindrome (22999922).

The spelling of 11881111 in words is "eleven million, eight hundred eighty-one thousand, one hundred eleven".