561730287 has 4 divisors (see below), whose sum is σ = 748973720. Its totient is φ = 374486856.

The previous prime is 561730283. The next prime is 561730289. The reversal of 561730287 is 782037165.

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

It is not a de Polignac number, because 561730287 - 2² = 561730283 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 (561730283) 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, 93621712 + ... + 93621717.

It is an arithmetic number, because the mean of its divisors is an integer number (187243430).

Almost surely, 2^561730287 is an apocalyptic number.

561730287 is a deficient number, since it is larger than the sum of its proper divisors (187243433).

561730287 is a wasteful number, since it uses less digits than its factorization.

561730287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187243432.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 561730287 is about 23700.8499214691. The cubic root of 561730287 is about 825.1051164500.

The spelling of 561730287 in words is "five hundred sixty-one million, seven hundred thirty thousand, two hundred eighty-seven".