111216685 has 8 divisors (see below), whose sum is σ = 137765376. Its totient is φ = 86103120.

The previous prime is 111216673. The next prime is 111216691. The reversal of 111216685 is 586612111.

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

It is not a de Polignac number, because 111216685 - 2¹⁹ = 110692397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358609 + ... + 358918.

It is an arithmetic number, because the mean of its divisors is an integer number (17220672).

Almost surely, 2^111216685 is an apocalyptic number.

It is an amenable number.

111216685 is a deficient number, since it is larger than the sum of its proper divisors (26548691).

111216685 is an equidigital number, since it uses as much as digits as its factorization.

111216685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717563.

The product of its digits is 2880, while the sum is 31.

The square root of 111216685 is about 10545.9321541531. The cubic root of 111216685 is about 480.9020724652.

Adding to 111216685 its reverse (586612111), we get a palindrome (697828796).

The spelling of 111216685 in words is "one hundred eleven million, two hundred sixteen thousand, six hundred eighty-five".