5518709 has 4 divisors (see below), whose sum is σ = 6307104. Its totient is φ = 4730316.

The previous prime is 5518687. The next prime is 5518817. The reversal of 5518709 is 9078155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9078155 = 5 ⋅1815631.

It is a cyclic number.

It is not a de Polignac number, because 5518709 - 2⁸ = 5518453 is a prime.

It is a super-2 number, since 2×5518709² = 60912298053362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5518109) 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, 394187 + ... + 394200.

It is an arithmetic number, because the mean of its divisors is an integer number (1576776).

Almost surely, 2^5518709 is an apocalyptic number.

It is an amenable number.

5518709 is a deficient number, since it is larger than the sum of its proper divisors (788395).

5518709 is an equidigital number, since it uses as much as digits as its factorization.

5518709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788394.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 5518709 is about 2349.1932657830. The cubic root of 5518709 is about 176.7173396037.

The spelling of 5518709 in words is "five million, five hundred eighteen thousand, seven hundred nine".