11209881 has 8 divisors (see below), whose sum is σ = 15033600. Its totient is φ = 7429712.

The previous prime is 11209859. The next prime is 11209907. The reversal of 11209881 is 18890211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11209881 - 2¹³ = 11201689 is a prime.

It is a super-2 number, since 2×11209881² = 251322864068322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11209811) 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 7 ways as a sum of consecutive naturals, for example, 10281 + ... + 11318.

It is an arithmetic number, because the mean of its divisors is an integer number (1879200).

Almost surely, 2^11209881 is an apocalyptic number.

It is an amenable number.

11209881 is a deficient number, since it is larger than the sum of its proper divisors (3823719).

11209881 is a wasteful number, since it uses less digits than its factorization.

11209881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21775.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 11209881 is about 3348.1160374157. The cubic root of 11209881 is about 223.8035652994.

It can be divided in two parts, 11209 and 881, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 11209881 in words is "eleven million, two hundred nine thousand, eight hundred eighty-one".