281986073 has 2 divisors, whose sum is σ = 281986074. Its totient is φ = 281986072.

The previous prime is 281986057. The next prime is 281986091. The reversal of 281986073 is 370689182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211644304 + 70341769 = 14548^2 + 8387^2 .

It is a cyclic number.

It is not a de Polignac number, because 281986073 - 2⁴ = 281986057 is a prime.

It is a super-2 number, since 2×281986073² = 159032290731922658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (281986043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140993036 + 140993037.

It is an arithmetic number, because the mean of its divisors is an integer number (140993037).

Almost surely, 2^281986073 is an apocalyptic number.

It is an amenable number.

281986073 is a deficient number, since it is larger than the sum of its proper divisors (1).

281986073 is an equidigital number, since it uses as much as digits as its factorization.

281986073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 281986073 is about 16792.4409482362. The cubic root of 281986073 is about 655.7564230846.

The spelling of 281986073 in words is "two hundred eighty-one million, nine hundred eighty-six thousand, seventy-three".