11809111 has 2 divisors, whose sum is σ = 11809112. Its totient is φ = 11809110.

The previous prime is 11809103. The next prime is 11809141. The reversal of 11809111 is 11190811.

11809111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 11160811 and 11806111.

It is a cyclic number.

It is not a de Polignac number, because 11809111 - 2³ = 11809103 is a prime.

It is a super-2 number, since 2×11809111² = 278910205220642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11809141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5904555 + 5904556.

It is an arithmetic number, because the mean of its divisors is an integer number (5904556).

Almost surely, 2^11809111 is an apocalyptic number.

11809111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11809111 is an equidigital number, since it uses as much as digits as its factorization.

11809111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The square root of 11809111 is about 3436.4387088962. The cubic root of 11809111 is about 227.7223909132.

Adding to 11809111 its reverse (11190811), we get a palindrome (22999922).

The spelling of 11809111 in words is "eleven million, eight hundred nine thousand, one hundred eleven".