280842481 has 2 divisors, whose sum is σ = 280842482. Its totient is φ = 280842480.

The previous prime is 280842473. The next prime is 280842509. The reversal of 280842481 is 184248082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266211856 + 14630625 = 16316^2 + 3825^2 .

It is a cyclic number.

It is not a de Polignac number, because 280842481 - 2³ = 280842473 is a prime.

It is a super-2 number, since 2×280842481² = 157744998268470722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280842481.

It is not a weakly prime, because it can be changed into another prime (280842421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140421240 + 140421241.

It is an arithmetic number, because the mean of its divisors is an integer number (140421241).

Almost surely, 2^280842481 is an apocalyptic number.

It is an amenable number.

280842481 is a deficient number, since it is larger than the sum of its proper divisors (1).

280842481 is an equidigital number, since it uses as much as digits as its factorization.

280842481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32768, while the sum is 37.

The square root of 280842481 is about 16758.3555577509. The cubic root of 280842481 is about 654.8687505797.

The spelling of 280842481 in words is "two hundred eighty million, eight hundred forty-two thousand, four hundred eighty-one".