5509681 has 4 divisors (see below), whose sum is σ = 5699700. Its totient is φ = 5319664.

The previous prime is 5509657. The next prime is 5509687. The reversal of 5509681 is 1869055.

5509681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4264225 + 1245456 = 2065^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 5509681 - 2¹⁷ = 5378609 is a prime.

It is a super-2 number, since 2×5509681² = 60713169443522, which contains 22 as substring.

It is a Duffinian number.

5509681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5509687) 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, 94966 + ... + 95023.

It is an arithmetic number, because the mean of its divisors is an integer number (1424925).

Almost surely, 2^5509681 is an apocalyptic number.

It is an amenable number.

5509681 is a deficient number, since it is larger than the sum of its proper divisors (190019).

5509681 is a wasteful number, since it uses less digits than its factorization.

5509681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190018.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 5509681 is about 2347.2709685931. The cubic root of 5509681 is about 176.6209236423.

The spelling of 5509681 in words is "five million, five hundred nine thousand, six hundred eighty-one".