5561563281 has 16 divisors (see below), whose sum is σ = 7439732160. Its totient is φ = 3695569920.

The previous prime is 5561563253. The next prime is 5561563297. The reversal of 5561563281 is 1823651655.

It is a happy number.

It is not a de Polignac number, because 5561563281 - 2¹¹ = 5561561233 is a prime.

It is a super-2 number, since 2×5561563281² = 61861972257134969922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5561563201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2611225 + ... + 2613353.

It is an arithmetic number, because the mean of its divisors is an integer number (464983260).

Almost surely, 2^5561563281 is an apocalyptic number.

It is an amenable number.

5561563281 is a deficient number, since it is larger than the sum of its proper divisors (1878168879).

5561563281 is a wasteful number, since it uses less digits than its factorization.

5561563281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576.

The product of its digits is 216000, while the sum is 42.

The square root of 5561563281 is about 74575.8894080386. The cubic root of 5561563281 is about 1771.7358014093.

The spelling of 5561563281 in words is "five billion, five hundred sixty-one million, five hundred sixty-three thousand, two hundred eighty-one".