11188661 has 8 divisors (see below), whose sum is σ = 12231648. Its totient is φ = 10150000.

The previous prime is 11188657. The next prime is 11188673. The reversal of 11188661 is 16688111.

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 11188661 - 2² = 11188657 is a prime.

It is a super-2 number, since 2×11188661² = 250372269945842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11188621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6986 + ... + 8436.

It is an arithmetic number, because the mean of its divisors is an integer number (1528956).

Almost surely, 2^11188661 is an apocalyptic number.

11188661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11188661 is a deficient number, since it is larger than the sum of its proper divisors (1042987).

11188661 is a wasteful number, since it uses less digits than its factorization.

11188661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163.

The product of its digits is 2304, while the sum is 32.

The square root of 11188661 is about 3344.9455899910. The cubic root of 11188661 is about 223.6622580766.

It can be divided in two parts, 1118 and 8661, that added together give a palindrome (9779).

The spelling of 11188661 in words is "eleven million, one hundred eighty-eight thousand, six hundred sixty-one".