1109561813 has 2 divisors, whose sum is σ = 1109561814. Its totient is φ = 1109561812.

The previous prime is 1109561773. The next prime is 1109561863. The reversal of 1109561813 is 3181659011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064912689 + 44649124 = 32633^2 + 6682^2 .

It is an emirp because it is prime and its reverse (3181659011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109561813 - 2⁶ = 1109561749 is a prime.

It is a super-2 number, since 2×1109561813² = 2462254833735693938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109561863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554780906 + 554780907.

It is an arithmetic number, because the mean of its divisors is an integer number (554780907).

Almost surely, 2^1109561813 is an apocalyptic number.

It is an amenable number.

1109561813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109561813 is an equidigital number, since it uses as much as digits as its factorization.

1109561813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1109561813 is about 33310.0857549181. The cubic root of 1109561813 is about 1035.2625417816.

The spelling of 1109561813 in words is "one billion, one hundred nine million, five hundred sixty-one thousand, eight hundred thirteen".