561646273 has 8 divisors (see below), whose sum is σ = 581934888. Its totient is φ = 541626624.

The previous prime is 561646271. The next prime is 561646291. The reversal of 561646273 is 372646165.

It can be written as a sum of positive squares in 4 ways, for example, as 69338929 + 492307344 = 8327^2 + 22188^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561646273 - 2¹ = 561646271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561646271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62986 + ... + 71347.

It is an arithmetic number, because the mean of its divisors is an integer number (72741861).

Almost surely, 2^561646273 is an apocalyptic number.

It is an amenable number.

561646273 is a deficient number, since it is larger than the sum of its proper divisors (20288615).

561646273 is a wasteful number, since it uses less digits than its factorization.

561646273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134483.

The product of its digits is 181440, while the sum is 40.

The square root of 561646273 is about 23699.0774714966. The cubic root of 561646273 is about 825.0639793664.

The spelling of 561646273 in words is "five hundred sixty-one million, six hundred forty-six thousand, two hundred seventy-three".