11209889 has 4 divisors (see below), whose sum is σ = 11320980. Its totient is φ = 11098800.

The previous prime is 11209859. The next prime is 11209907. The reversal of 11209889 is 98890211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11022400 + 187489 = 3320^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 11209889 - 2²⁰ = 10161313 is a prime.

It is a super-2 number, since 2×11209889² = 251323222784642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11209819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55394 + ... + 55595.

It is an arithmetic number, because the mean of its divisors is an integer number (2830245).

Almost surely, 2^11209889 is an apocalyptic number.

It is an amenable number.

11209889 is a deficient number, since it is larger than the sum of its proper divisors (111091).

11209889 is a wasteful number, since it uses less digits than its factorization.

11209889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111090.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 11209889 is about 3348.1172321172. The cubic root of 11209889 is about 223.8036185390.

The spelling of 11209889 in words is "eleven million, two hundred nine thousand, eight hundred eighty-nine".