111102661 has 4 divisors (see below), whose sum is σ = 113812524. Its totient is φ = 108392800.

The previous prime is 111102659. The next prime is 111102697. The reversal of 111102661 is 166201111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166201111 = 5171 ⋅32141.

It can be written as a sum of positive squares in 2 ways, for example, as 38750625 + 72352036 = 6225^2 + 8506^2 .

It is a cyclic number.

It is not a de Polignac number, because 111102661 - 2¹ = 111102659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102631) 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, 1354870 + ... + 1354951.

It is an arithmetic number, because the mean of its divisors is an integer number (28453131).

Almost surely, 2^111102661 is an apocalyptic number.

It is an amenable number.

111102661 is a deficient number, since it is larger than the sum of its proper divisors (2709863).

111102661 is an equidigital number, since it uses as much as digits as its factorization.

111102661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709862.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 111102661 is about 10540.5247023097. The cubic root of 111102661 is about 480.7376692911.

Adding to 111102661 its reverse (166201111), we get a palindrome (277303772).

The spelling of 111102661 in words is "one hundred eleven million, one hundred two thousand, six hundred sixty-one".