285716561 has 8 divisors (see below), whose sum is σ = 307871424. Its totient is φ = 263586960.

The previous prime is 285716537. The next prime is 285716573. The reversal of 285716561 is 165617582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-285716561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285716521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21866 + ... + 32396.

It is an arithmetic number, because the mean of its divisors is an integer number (38483928).

Almost surely, 2^285716561 is an apocalyptic number.

It is an amenable number.

285716561 is a deficient number, since it is larger than the sum of its proper divisors (22154863).

285716561 is a wasteful number, since it uses less digits than its factorization.

285716561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12631.

The product of its digits is 100800, while the sum is 41.

The square root of 285716561 is about 16903.1523982954. The cubic root of 285716561 is about 658.6355043470.

The spelling of 285716561 in words is "two hundred eighty-five million, seven hundred sixteen thousand, five hundred sixty-one".