561226613 has 6 divisors (see below), whose sum is σ = 567611394. Its totient is φ = 554912864.

The previous prime is 561226609. The next prime is 561226651. The reversal of 561226613 is 316622165.

It can be written as a sum of positive squares in 3 ways, for example, as 41705764 + 519520849 = 6458^2 + 22793^2 .

It is not a de Polignac number, because 561226613 - 2² = 561226609 is a prime.

It is a super-2 number, since 2×561226613² = 629950622278903538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561226613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561226513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27506 + ... + 43347.

It is an arithmetic number, because the mean of its divisors is an integer number (94601899).

Almost surely, 2^561226613 is an apocalyptic number.

It is an amenable number.

561226613 is a deficient number, since it is larger than the sum of its proper divisors (6384781).

561226613 is an frugal number, since it uses more digits than its factorization.

561226613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71031 (or 70942 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 561226613 is about 23690.2218858330. The cubic root of 561226613 is about 824.8584332542.

Adding to 561226613 its reverse (316622165), we get a palindrome (877848778).

The spelling of 561226613 in words is "five hundred sixty-one million, two hundred twenty-six thousand, six hundred thirteen".