561626 has 8 divisors (see below), whose sum is σ = 907284. Its totient is φ = 259200.

The previous prime is 561607. The next prime is 561667. The reversal of 561626 is 626165.

561626 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 561001 + 625 = 749^2 + 25^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 21601 = 561626 / (5 + 6 + 1 + 6 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 561595 and 561604.

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, 10775 + ... + 10826.

2⁵⁶¹⁶²⁶ is an apocalyptic number.

561626 is a deficient number, since it is larger than the sum of its proper divisors (345658).

561626 is a wasteful number, since it uses less digits than its factorization.

561626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21616.

The product of its digits is 2160, while the sum is 26.

The square root of 561626 is about 749.4171068237. The cubic root of 561626 is about 82.5054052167.

The spelling of 561626 in words is "five hundred sixty-one thousand, six hundred twenty-six".