1109813 has 2 divisors, whose sum is σ = 1109814. Its totient is φ = 1109812.

The previous prime is 1109791. The next prime is 1109821. The reversal of 1109813 is 3189011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935089 + 174724 = 967^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109813 - 2⁶ = 1109749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554906 + 554907.

It is an arithmetic number, because the mean of its divisors is an integer number (554907).

2^1109813 is an apocalyptic number.

It is an amenable number.

1109813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109813 is an equidigital number, since it uses as much as digits as its factorization.

1109813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1109813 is about 1053.4766252746. The cubic root of 1109813 is about 103.5340658166.

It can be divided in two parts, 11098 and 13, that added together give a palindrome (11111).

The spelling of 1109813 in words is "one million, one hundred nine thousand, eight hundred thirteen".