281713981 has 2 divisors, whose sum is σ = 281713982. Its totient is φ = 281713980.

The previous prime is 281713951. The next prime is 281713997. The reversal of 281713981 is 189317182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276723225 + 4990756 = 16635^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 281713981 - 2¹³ = 281705789 is a prime.

It is a super-2 number, since 2×281713981² = 158725534181736722, 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 (281713951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140856990 + 140856991.

It is an arithmetic number, because the mean of its divisors is an integer number (140856991).

Almost surely, 2^281713981 is an apocalyptic number.

It is an amenable number.

281713981 is a deficient number, since it is larger than the sum of its proper divisors (1).

281713981 is an equidigital number, since it uses as much as digits as its factorization.

281713981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 281713981 is about 16784.3373714901. The cubic root of 281713981 is about 655.5454392653.

The spelling of 281713981 in words is "two hundred eighty-one million, seven hundred thirteen thousand, nine hundred eighty-one".