281860561 has 16 divisors (see below), whose sum is σ = 319849344. Its totient is φ = 246875904.

The previous prime is 281860559. The next prime is 281860567. The reversal of 281860561 is 165068182.

It is not a de Polignac number, because 281860561 - 2¹ = 281860559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281860561.

It is not an unprimeable number, because it can be changed into a prime (281860567) 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, 4726 + ... + 24208.

It is an arithmetic number, because the mean of its divisors is an integer number (19990584).

Almost surely, 2^281860561 is an apocalyptic number.

It is an amenable number.

281860561 is a deficient number, since it is larger than the sum of its proper divisors (37988783).

281860561 is a wasteful number, since it uses less digits than its factorization.

281860561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19560.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 281860561 is about 16788.7033745909. The cubic root of 281860561 is about 655.6591162523.

The spelling of 281860561 in words is "two hundred eighty-one million, eight hundred sixty thousand, five hundred sixty-one".