280555381 has 2 divisors, whose sum is σ = 280555382. Its totient is φ = 280555380.

The previous prime is 280555351. The next prime is 280555441. The reversal of 280555381 is 183555082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241305156 + 39250225 = 15534^2 + 6265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280555381 is a prime.

It is a super-2 number, since 2×280555381² = 157422643616110322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280555381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280555321) 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 as a sum of consecutive naturals, namely, 140277690 + 140277691.

It is an arithmetic number, because the mean of its divisors is an integer number (140277691).

Almost surely, 2^280555381 is an apocalyptic number.

It is an amenable number.

280555381 is a deficient number, since it is larger than the sum of its proper divisors (1).

280555381 is an equidigital number, since it uses as much as digits as its factorization.

280555381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 280555381 is about 16749.7874911893. The cubic root of 280555381 is about 654.6455211483.

The spelling of 280555381 in words is "two hundred eighty million, five hundred fifty-five thousand, three hundred eighty-one".