280052809 has 2 divisors, whose sum is σ = 280052810. Its totient is φ = 280052808.

The previous prime is 280052771. The next prime is 280052813. The reversal of 280052809 is 908250082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279725625 + 327184 = 16725^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 280052809 - 2¹¹ = 280050761 is a prime.

It is a super-3 number, since 3×280052809³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (280052819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140026404 + 140026405.

It is an arithmetic number, because the mean of its divisors is an integer number (140026405).

Almost surely, 2^280052809 is an apocalyptic number.

It is an amenable number.

280052809 is a deficient number, since it is larger than the sum of its proper divisors (1).

280052809 is an equidigital number, since it uses as much as digits as its factorization.

280052809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 280052809 is about 16734.7784269766. The cubic root of 280052809 is about 654.2543884382.

The spelling of 280052809 in words is "two hundred eighty million, fifty-two thousand, eight hundred nine".