5518561 has 8 divisors (see below), whose sum is σ = 5619240. Its totient is φ = 5419008.

The previous prime is 5518553. The next prime is 5518567. The reversal of 5518561 is 1658155.

5518561 = T₆₅ + T₆₆ + ... + T₃₂₁.

It can be written as a sum of positive squares in 4 ways, for example, as 4579600 + 938961 = 2140^2 + 969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5518561 - 2³ = 5518553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5518567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21345 + ... + 21601.

It is an arithmetic number, because the mean of its divisors is an integer number (702405).

Almost surely, 2^5518561 is an apocalyptic number.

It is an amenable number.

5518561 is a deficient number, since it is larger than the sum of its proper divisors (100679).

5518561 is a wasteful number, since it uses less digits than its factorization.

5518561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its digits is 6000, while the sum is 31.

The square root of 5518561 is about 2349.1617653963. The cubic root of 5518561 is about 176.7157598622.

The spelling of 5518561 in words is "five million, five hundred eighteen thousand, five hundred sixty-one".