281089813 has 2 divisors, whose sum is σ = 281089814. Its totient is φ = 281089812.

The previous prime is 281089811. The next prime is 281089829. The reversal of 281089813 is 318980182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148425489 + 132664324 = 12183^2 + 11518^2 .

It is a cyclic number.

It is not a de Polignac number, because 281089813 - 2¹ = 281089811 is a prime.

It is a super-2 number, since 2×281089813² = 158022965944749938, which contains 22 as substring.

Together with 281089811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281089811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140544906 + 140544907.

It is an arithmetic number, because the mean of its divisors is an integer number (140544907).

Almost surely, 2^281089813 is an apocalyptic number.

It is an amenable number.

281089813 is a deficient number, since it is larger than the sum of its proper divisors (1).

281089813 is an equidigital number, since it uses as much as digits as its factorization.

281089813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 281089813 is about 16765.7332974135. The cubic root of 281089813 is about 655.0609371661.

The spelling of 281089813 in words is "two hundred eighty-one million, eighty-nine thousand, eight hundred thirteen".