1113661 has 4 divisors (see below), whose sum is σ = 1118524. Its totient is φ = 1108800.

The previous prime is 1113643. The next prime is 1113667. The reversal of 1113661 is 1663111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1663111 = 43 ⋅38677.

It can be written as a sum of positive squares in 2 ways, for example, as 632025 + 481636 = 795^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1113661 - 2⁹ = 1113149 is a prime.

It is a Duffinian number.

1113661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070 + ... + 2551.

It is an arithmetic number, because the mean of its divisors is an integer number (279631).

2^1113661 is an apocalyptic number.

It is an amenable number.

1113661 is a deficient number, since it is larger than the sum of its proper divisors (4863).

1113661 is an equidigital number, since it uses as much as digits as its factorization.

1113661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862.

The product of its digits is 108, while the sum is 19.

The square root of 1113661 is about 1055.3013787540. The cubic root of 1113661 is about 103.6535873096.

Adding to 1113661 its reverse (1663111), we get a palindrome (2776772).

The spelling of 1113661 in words is "one million, one hundred thirteen thousand, six hundred sixty-one".