561268609 has 16 divisors (see below), whose sum is σ = 659533824. Its totient is φ = 472309200.

The previous prime is 561268601. The next prime is 561268613. The reversal of 561268609 is 906862165.

It is not a de Polignac number, because 561268609 - 2³ = 561268601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561268601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27939 + ... + 43624.

It is an arithmetic number, because the mean of its divisors is an integer number (41220864).

Almost surely, 2^561268609 is an apocalyptic number.

It is an amenable number.

561268609 is a deficient number, since it is larger than the sum of its proper divisors (98265215).

561268609 is a wasteful number, since it uses less digits than its factorization.

561268609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71628.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 561268609 is about 23691.1082265056. The cubic root of 561268609 is about 824.8790071721.

The spelling of 561268609 in words is "five hundred sixty-one million, two hundred sixty-eight thousand, six hundred nine".