561536917 has 4 divisors (see below), whose sum is σ = 561861196. Its totient is φ = 561212640.

The previous prime is 561536897. The next prime is 561536923. The reversal of 561536917 is 719635165.

It is a happy number.

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 87778161 + 473758756 = 9369^2 + 21766^2 .

It is a cyclic number.

It is not a de Polignac number, because 561536917 - 2¹⁵ = 561504149 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 (561536117) 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, 159528 + ... + 163009.

It is an arithmetic number, because the mean of its divisors is an integer number (140465299).

Almost surely, 2^561536917 is an apocalyptic number.

It is an amenable number.

561536917 is a deficient number, since it is larger than the sum of its proper divisors (324279).

561536917 is a wasteful number, since it uses less digits than its factorization.

561536917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324278.

The product of its digits is 170100, while the sum is 43.

The square root of 561536917 is about 23696.7701807651. The cubic root of 561536917 is about 825.0104275388.

The spelling of 561536917 in words is "five hundred sixty-one million, five hundred thirty-six thousand, nine hundred seventeen".