1320111 has 16 divisors (see below), whose sum is σ = 2106720. Its totient is φ = 812160.

The previous prime is 1320107. The next prime is 1320113. The reversal of 1320111 is 1110231.

It is not a de Polignac number, because 1320111 - 2² = 1320107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1320093 and 1320102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1530 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (131670).

2^1320111 is an apocalyptic number.

1320111 is a deficient number, since it is larger than the sum of its proper divisors (786609).

1320111 is a wasteful number, since it uses less digits than its factorization.

1320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783 (or 3777 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1320111 is about 1148.9608348416. The cubic root of 1320111 is about 109.6992057783.

Adding to 1320111 its reverse (1110231), we get a palindrome (2430342).

It can be divided in two parts, 1320 and 111, that added together give a triangular number (1431 = T₅₃).

The spelling of 1320111 in words is "one million, three hundred twenty thousand, one hundred eleven".