280243281 has 16 divisors (see below), whose sum is σ = 382595328. Its totient is φ = 182380800.

The previous prime is 280243279. The next prime is 280243307. The reversal of 280243281 is 182342082.

It is not a de Polignac number, because 280243281 - 2¹ = 280243279 is a prime.

It is a super-2 number, since 2×280243281² = 157072593091289922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280243081) 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 15 ways as a sum of consecutive naturals, for example, 57001 + ... + 61721.

It is an arithmetic number, because the mean of its divisors is an integer number (23912208).

Almost surely, 2^280243281 is an apocalyptic number.

It is an amenable number.

280243281 is a deficient number, since it is larger than the sum of its proper divisors (102352047).

280243281 is a wasteful number, since it uses less digits than its factorization.

280243281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 280243281 is about 16740.4683626235. The cubic root of 280243281 is about 654.4026805896.

The spelling of 280243281 in words is "two hundred eighty million, two hundred forty-three thousand, two hundred eighty-one".