11111611 has 16 divisors (see below), whose sum is σ = 13271040. Its totient is φ = 9102240.

The previous prime is 11111579. The next prime is 11111621. The reversal of 11111611 is 11611111.

It is not a de Polignac number, because 11111611 - 2⁵ = 11111579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111591 and 11111600.

It is not an unprimeable number, because it can be changed into a prime (11111621) 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, 25566 + ... + 25996.

It is an arithmetic number, because the mean of its divisors is an integer number (829440).

Almost surely, 2^11111611 is an apocalyptic number.

11111611 is a deficient number, since it is larger than the sum of its proper divisors (2159429).

11111611 is a wasteful number, since it uses less digits than its factorization.

11111611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its digits is 6, while the sum is 13.

The square root of 11111611 is about 3333.4083158233. The cubic root of 11111611 is about 223.1476630648.

Adding to 11111611 its reverse (11611111), we get a palindrome (22722722).

Subtracting 11111611 from its reverse (11611111), we obtain a triangular number (499500 = T₉₉₉).

It can be divided in two parts, 111 and 11611, that multiplied together give a palindrome (1288821).

The spelling of 11111611 in words is "eleven million, one hundred eleven thousand, six hundred eleven".