561805693 has 4 divisors (see below), whose sum is σ = 563894460. Its totient is φ = 559716928.

The previous prime is 561805687. The next prime is 561805703. The reversal of 561805693 is 396508165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140612164 + 421193529 = 11858^2 + 20523^2 .

It is a cyclic number.

It is not a de Polignac number, because 561805693 - 2¹³ = 561797501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561805093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043980 + ... + 1044517.

It is an arithmetic number, because the mean of its divisors is an integer number (140973615).

Almost surely, 2^561805693 is an apocalyptic number.

It is an amenable number.

561805693 is a deficient number, since it is larger than the sum of its proper divisors (2088767).

561805693 is a wasteful number, since it uses less digits than its factorization.

561805693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088766.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 561805693 is about 23702.4406549199. The cubic root of 561805693 is about 825.1420351718.

The spelling of 561805693 in words is "five hundred sixty-one million, eight hundred five thousand, six hundred ninety-three".