281128361 has 2 divisors, whose sum is σ = 281128362. Its totient is φ = 281128360.

The previous prime is 281128319. The next prime is 281128363. The reversal of 281128361 is 163821182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244453225 + 36675136 = 15635^2 + 6056^2 .

It is a cyclic number.

It is not a de Polignac number, because 281128361 - 2¹⁰ = 281127337 is a prime.

Together with 281128363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (281128363) 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, 140564180 + 140564181.

It is an arithmetic number, because the mean of its divisors is an integer number (140564181).

Almost surely, 2^281128361 is an apocalyptic number.

It is an amenable number.

281128361 is a deficient number, since it is larger than the sum of its proper divisors (1).

281128361 is an equidigital number, since it uses as much as digits as its factorization.

281128361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 281128361 is about 16766.8828647426. The cubic root of 281128361 is about 655.0908803060.

The spelling of 281128361 in words is "two hundred eighty-one million, one hundred twenty-eight thousand, three hundred sixty-one".