561649533 has 8 divisors (see below), whose sum is σ = 762995808. Its totient is φ = 367368144.

The previous prime is 561649511. The next prime is 561649549. The reversal of 561649533 is 335946165.

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

It is not a de Polignac number, because 561649533 - 2⁶ = 561649469 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561642533) 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 7 ways as a sum of consecutive naturals, for example, 1766035 + ... + 1766352.

It is an arithmetic number, because the mean of its divisors is an integer number (95374476).

Almost surely, 2^561649533 is an apocalyptic number.

561649533 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

561649533 is a deficient number, since it is larger than the sum of its proper divisors (201346275).

561649533 is a wasteful number, since it uses less digits than its factorization.

561649533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532443.

The product of its digits is 291600, while the sum is 42.

The square root of 561649533 is about 23699.1462504454. The cubic root of 561649533 is about 825.0655756874.

The spelling of 561649533 in words is "five hundred sixty-one million, six hundred forty-nine thousand, five hundred thirty-three".