561781246 has 16 divisors (see below), whose sum is σ = 955256400. Its totient is φ = 245636928.

The previous prime is 561781237. The next prime is 561781277. The reversal of 561781246 is 642187165.

It is a junction number, because it is equal to n+sod(n) for n = 561781199 and 561781208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568111 + ... + 569098.

It is an arithmetic number, because the mean of its divisors is an integer number (59703525).

Almost surely, 2^561781246 is an apocalyptic number.

561781246 is a deficient number, since it is larger than the sum of its proper divisors (393475154).

561781246 is a wasteful number, since it uses less digits than its factorization.

561781246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137243.

The product of its digits is 80640, while the sum is 40.

The square root of 561781246 is about 23701.9249429239. The cubic root of 561781246 is about 825.1300663006.

The spelling of 561781246 in words is "five hundred sixty-one million, seven hundred eighty-one thousand, two hundred forty-six".