561227645 has 12 divisors (see below), whose sum is σ = 740264700. Its totient is φ = 408165120.

The previous prime is 561227629. The next prime is 561227671. The reversal of 561227645 is 546722165.

It can be written as a sum of positive squares in 2 ways, for example, as 256864729 + 304362916 = 16027^2 + 17446^2 .

It is not a de Polignac number, because 561227645 - 2⁴ = 561227629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561227599 and 561227608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 463220 + ... + 464429.

It is an arithmetic number, because the mean of its divisors is an integer number (61688725).

Almost surely, 2^561227645 is an apocalyptic number.

561227645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561227645 is a deficient number, since it is larger than the sum of its proper divisors (179037055).

561227645 is a wasteful number, since it uses less digits than its factorization.

561227645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927676 (or 927665 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 561227645 is about 23690.2436669613. The cubic root of 561227645 is about 824.8589388452.

The spelling of 561227645 in words is "five hundred sixty-one million, two hundred twenty-seven thousand, six hundred forty-five".