561390587 has 16 divisors (see below), whose sum is σ = 598752000. Its totient is φ = 524852640.

The previous prime is 561390553. The next prime is 561390593. The reversal of 561390587 is 785093165.

It is a cyclic number.

It is not a de Polignac number, because 561390587 - 2¹² = 561386491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561390527) 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 15 ways as a sum of consecutive naturals, for example, 936914 + ... + 937512.

It is an arithmetic number, because the mean of its divisors is an integer number (37422000).

Almost surely, 2^561390587 is an apocalyptic number.

561390587 is a deficient number, since it is larger than the sum of its proper divisors (37361413).

561390587 is a wasteful number, since it uses less digits than its factorization.

561390587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 561390587 is about 23693.6824280229. The cubic root of 561390587 is about 824.9387586007.

The spelling of 561390587 in words is "five hundred sixty-one million, three hundred ninety thousand, five hundred eighty-seven".