561690005 has 4 divisors (see below), whose sum is σ = 674028012. Its totient is φ = 449352000.

The previous prime is 561689983. The next prime is 561690029. The reversal of 561690005 is 500096165.

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 218773681 + 342916324 = 14791^2 + 18518^2 .

It is not a de Polignac number, because 561690005 - 2²⁴ = 544912789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56168996 + ... + 56169005.

It is an arithmetic number, because the mean of its divisors is an integer number (168507003).

Almost surely, 2^561690005 is an apocalyptic number.

It is an amenable number.

561690005 is a deficient number, since it is larger than the sum of its proper divisors (112338007).

561690005 is a wasteful number, since it uses less digits than its factorization.

561690005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112338006.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 561690005 is about 23700.0001054852. Note that the first 3 decimals coincide. The cubic root of 561690005 is about 825.0853930587.

The spelling of 561690005 in words is "five hundred sixty-one million, six hundred ninety thousand, five".