561226636 has 12 divisors (see below), whose sum is σ = 1033838680. Its totient is φ = 265844160.

The previous prime is 561226609. The next prime is 561226651. The reversal of 561226636 is 636622165.

It is a junction number, because it is equal to n+sod(n) for n = 561226595 and 561226604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3692205 + ... + 3692356.

Almost surely, 2^561226636 is an apocalyptic number.

It is an amenable number.

561226636 is a deficient number, since it is larger than the sum of its proper divisors (472612044).

561226636 is a wasteful number, since it uses less digits than its factorization.

561226636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384584 (or 7384582 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 561226636 is about 23690.2223712653. Note that the first 3 decimals coincide. The cubic root of 561226636 is about 824.8584445223.

The spelling of 561226636 in words is "five hundred sixty-one million, two hundred twenty-six thousand, six hundred thirty-six".