8739281 has 2 divisors, whose sum is σ = 8739282. Its totient is φ = 8739280.

The previous prime is 8739209. The next prime is 8739299. The reversal of 8739281 is 1829378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 2588881 = 2480^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 8739281 - 2¹⁸ = 8477137 is a prime.

It is a super-2 number, since 2×8739281² = 152750064793922, which contains 22 as substring.

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 (8739481) 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, 4369640 + 4369641.

It is an arithmetic number, because the mean of its divisors is an integer number (4369641).

Almost surely, 2^8739281 is an apocalyptic number.

It is an amenable number.

8739281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8739281 is an equidigital number, since it uses as much as digits as its factorization.

8739281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 8739281 is about 2956.2274946289. The cubic root of 8739281 is about 205.9800857363.

Subtracting from 8739281 its reverse (1829378), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 8739281 in words is "eight million, seven hundred thirty-nine thousand, two hundred eighty-one".