561648531 has 8 divisors (see below), whose sum is σ = 788278720. Its totient is φ = 354725352.

The previous prime is 561648511. The next prime is 561648541. The reversal of 561648531 is 135846165.

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

It is not a de Polignac number, because 561648531 - 2⁹ = 561648019 is a prime.

It is a super-2 number, since 2×561648531² = 630898144748915922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561648531.

It is not an unprimeable number, because it can be changed into a prime (561648511) 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, 4926685 + ... + 4926798.

It is an arithmetic number, because the mean of its divisors is an integer number (98534840).

Almost surely, 2^561648531 is an apocalyptic number.

561648531 is a deficient number, since it is larger than the sum of its proper divisors (226630189).

561648531 is a wasteful number, since it uses less digits than its factorization.

561648531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853505.

The product of its digits is 86400, while the sum is 39.

The square root of 561648531 is about 23699.1251104339. The cubic root of 561648531 is about 825.0650850397.

The spelling of 561648531 in words is "five hundred sixty-one million, six hundred forty-eight thousand, five hundred thirty-one".