280046381 has 2 divisors, whose sum is σ = 280046382. Its totient is φ = 280046380.

The previous prime is 280046369. The next prime is 280046411. The reversal of 280046381 is 183640082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244453225 + 35593156 = 15635^2 + 5966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280046381 is a prime.

It is a super-2 number, since 2×280046381² = 156851951022394322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280046341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140023190 + 140023191.

It is an arithmetic number, because the mean of its divisors is an integer number (140023191).

Almost surely, 2^280046381 is an apocalyptic number.

It is an amenable number.

280046381 is a deficient number, since it is larger than the sum of its proper divisors (1).

280046381 is an equidigital number, since it uses as much as digits as its factorization.

280046381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 280046381 is about 16734.5863707473. The cubic root of 280046381 is about 654.2493827402.

The spelling of 280046381 in words is "two hundred eighty million, forty-six thousand, three hundred eighty-one".