561916993 has 8 divisors (see below), whose sum is σ = 613317600. Its totient is φ = 510569280.

The previous prime is 561916981. The next prime is 561917009. The reversal of 561916993 is 399619165.

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 561916993 - 2¹⁷ = 561785921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561911993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10921 + ... + 35257.

It is an arithmetic number, because the mean of its divisors is an integer number (76664700).

Almost surely, 2^561916993 is an apocalyptic number.

It is an amenable number.

561916993 is a deficient number, since it is larger than the sum of its proper divisors (51400607).

561916993 is a wasteful number, since it uses less digits than its factorization.

561916993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26447.

The product of its digits is 393660, while the sum is 49.

The square root of 561916993 is about 23704.7883981275. The cubic root of 561916993 is about 825.1965215335.

The spelling of 561916993 in words is "five hundred sixty-one million, nine hundred sixteen thousand, nine hundred ninety-three".