280483561 has 4 divisors (see below), whose sum is σ = 296982612. Its totient is φ = 263984512.

The previous prime is 280483559. The next prime is 280483571. The reversal of 280483561 is 165384082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165384082 = 2 ⋅82692041.

It can be written as a sum of positive squares in 2 ways, for example, as 184443561 + 96040000 = 13581^2 + 9800^2 .

It is a cyclic number.

It is not a de Polignac number, because 280483561 - 2¹ = 280483559 is a prime.

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 280483561.

It is not an unprimeable number, because it can be changed into a prime (280483531) 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 3 ways as a sum of consecutive naturals, for example, 8249500 + ... + 8249533.

It is an arithmetic number, because the mean of its divisors is an integer number (74245653).

Almost surely, 2^280483561 is an apocalyptic number.

It is an amenable number.

280483561 is a deficient number, since it is larger than the sum of its proper divisors (16499051).

280483561 is a wasteful number, since it uses less digits than its factorization.

280483561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16499050.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 280483561 is about 16747.6434461688. The cubic root of 280483561 is about 654.5896549901.

It can be divided in two parts, 2804835 and 61, that added together give a triangular number (2804896 = T₂₃₆₈).

The spelling of 280483561 in words is "two hundred eighty million, four hundred eighty-three thousand, five hundred sixty-one".