1216111 has 8 divisors (see below), whose sum is σ = 1321040. Its totient is φ = 1112832.

The previous prime is 1216109. The next prime is 1216123. The reversal of 1216111 is 1116121.

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 1216111 - 2¹ = 1216109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216091 and 1216100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216151) 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, 1471 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (165130).

2^1216111 is an apocalyptic number.

1216111 is a deficient number, since it is larger than the sum of its proper divisors (104929).

1216111 is a wasteful number, since it uses less digits than its factorization.

1216111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its digits is 12, while the sum is 13.

The square root of 1216111 is about 1102.7742289336. The cubic root of 1216111 is about 106.7393135758.

The spelling of 1216111 in words is "one million, two hundred sixteen thousand, one hundred eleven".