1111681 has 4 divisors (see below), whose sum is σ = 1177092. Its totient is φ = 1046272.

The previous prime is 1111673. The next prime is 1111687. The reversal of 1111681 is 1861111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1861111 = 7 ⋅265873.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 614656 = 705^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111681 - 2³ = 1111673 is a prime.

It is a super-2 number, since 2×1111681² = 2471669291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111687) 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, 32680 + ... + 32713.

It is an arithmetic number, because the mean of its divisors is an integer number (294273).

2^1111681 is an apocalyptic number.

It is an amenable number.

1111681 is a deficient number, since it is larger than the sum of its proper divisors (65411).

1111681 is an equidigital number, since it uses as much as digits as its factorization.

1111681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65410.

The product of its digits is 48, while the sum is 19.

The square root of 1111681 is about 1054.3628407716. The cubic root of 1111681 is about 103.5921216114.

Adding to 1111681 its reverse (1861111), we get a palindrome (2972792).

The spelling of 1111681 in words is "one million, one hundred eleven thousand, six hundred eighty-one".