1331111 has 4 divisors (see below), whose sum is σ = 1338000. Its totient is φ = 1324224.

The previous prime is 1331107. The next prime is 1331119. The reversal of 1331111 is 1111331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111331 = 13 ⋅85487.

It is a cyclic number.

It is not a de Polignac number, because 1331111 - 2² = 1331107 is a prime.

It is an Ulam number.

It is a Duffinian number.

1331111 is a modest number, since divided by 1111 gives 133 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1331092 and 1331101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331119) 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, 3146 + ... + 3543.

It is an arithmetic number, because the mean of its divisors is an integer number (334500).

2^1331111 is an apocalyptic number.

1331111 is a deficient number, since it is larger than the sum of its proper divisors (6889).

1331111 is an equidigital number, since it uses as much as digits as its factorization.

1331111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888.

The product of its digits is 9, while the sum is 11.

The square root of 1331111 is about 1153.7378385058. The cubic root of 1331111 is about 110.0030577662.

Adding to 1331111 its reverse (1111331), we get a palindrome (2442442).

It can be divided in two parts, 1331 and 111, that multiplied together give a palindrome (147741).

The spelling of 1331111 in words is "one million, three hundred thirty-one thousand, one hundred eleven".