5561645 has 8 divisors (see below), whose sum is σ = 6689304. Its totient is φ = 4439104.

The previous prime is 5561641. The next prime is 5561657. The reversal of 5561645 is 5461655.

It can be written as a sum of positive squares in 4 ways, for example, as 299209 + 5262436 = 547^2 + 2294^2 .

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 5561645 - 2² = 5561641 is a prime.

It is a super-3 number, since 3×5561645³ (a number of 21 digits) contains 333 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 (5561641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787 + ... + 3783.

It is an arithmetic number, because the mean of its divisors is an integer number (836163).

Almost surely, 2^5561645 is an apocalyptic number.

It is an amenable number.

5561645 is a deficient number, since it is larger than the sum of its proper divisors (1127659).

5561645 is a wasteful number, since it uses less digits than its factorization.

5561645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559.

The product of its digits is 18000, while the sum is 32.

The square root of 5561645 is about 2358.3140164109. The cubic root of 5561645 is about 177.1744479051.

The spelling of 5561645 in words is "five million, five hundred sixty-one thousand, six hundred forty-five".