561609517 has 4 divisors (see below), whose sum is σ = 641839456. Its totient is φ = 481379580.

The previous prime is 561609511. The next prime is 561609527. The reversal of 561609517 is 715906165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561609517 is a prime.

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 561609517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561609511) 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 3 ways as a sum of consecutive naturals, for example, 40114959 + ... + 40114972.

It is an arithmetic number, because the mean of its divisors is an integer number (160459864).

Almost surely, 2^561609517 is an apocalyptic number.

It is an amenable number.

561609517 is a deficient number, since it is larger than the sum of its proper divisors (80229939).

561609517 is an equidigital number, since it uses as much as digits as its factorization.

561609517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80229938.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 561609517 is about 23698.3019855854. The cubic root of 561609517 is about 825.0459806635.

The spelling of 561609517 in words is "five hundred sixty-one million, six hundred nine thousand, five hundred seventeen".