561643015 has 12 divisors (see below), whose sum is σ = 683628552. Its totient is φ = 442966160.

The previous prime is 561643013. The next prime is 561643037. The reversal of 561643015 is 510346165.

It is not a de Polignac number, because 561643015 - 2¹ = 561643013 is a prime.

It is a super-3 number, since 3×561643015³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561643013) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 14064 + ... + 36346.

It is an arithmetic number, because the mean of its divisors is an integer number (56969046).

Almost surely, 2^561643015 is an apocalyptic number.

561643015 is a deficient number, since it is larger than the sum of its proper divisors (121985537).

561643015 is an equidigital number, since it uses as much as digits as its factorization.

561643015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22430 (or 22359 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 561643015 is about 23699.0087345442. The cubic root of 561643015 is about 825.0623840184.

The spelling of 561643015 in words is "five hundred sixty-one million, six hundred forty-three thousand, fifteen".