281260649 has 2 divisors, whose sum is σ = 281260650. Its totient is φ = 281260648.

The previous prime is 281260579. The next prime is 281260669. The reversal of 281260649 is 946062182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 272019049 + 9241600 = 16493^2 + 3040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281260649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (281260669) 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, 140630324 + 140630325.

It is an arithmetic number, because the mean of its divisors is an integer number (140630325).

Almost surely, 2^281260649 is an apocalyptic number.

It is an amenable number.

281260649 is a deficient number, since it is larger than the sum of its proper divisors (1).

281260649 is an equidigital number, since it uses as much as digits as its factorization.

281260649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 281260649 is about 16770.8273200817. The cubic root of 281260649 is about 655.1936175664.

The spelling of 281260649 in words is "two hundred eighty-one million, two hundred sixty thousand, six hundred forty-nine".