111520661 has 8 divisors (see below), whose sum is σ = 127540800. Its totient is φ = 95522688.

The previous prime is 111520637. The next prime is 111520687. The reversal of 111520661 is 166025111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111520661 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 (111520691) 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, 7205 + ... + 16581.

It is an arithmetic number, because the mean of its divisors is an integer number (15942600).

Almost surely, 2^111520661 is an apocalyptic number.

It is an amenable number.

111520661 is a deficient number, since it is larger than the sum of its proper divisors (16020139).

111520661 is an equidigital number, since it uses as much as digits as its factorization.

111520661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11083.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 111520661 is about 10560.3343223593. The cubic root of 111520661 is about 481.3398056725.

Adding to 111520661 its reverse (166025111), we get a palindrome (277545772).

The spelling of 111520661 in words is "one hundred eleven million, five hundred twenty thousand, six hundred sixty-one".