947285281 has 2 divisors, whose sum is σ = 947285282. Its totient is φ = 947285280.

The previous prime is 947285263. The next prime is 947285323. The reversal of 947285281 is 182582749.

947285281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 834054400 + 113230881 = 28880^2 + 10641^2 .

It is an emirp because it is prime and its reverse (182582749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 947285281 - 2¹⁷ = 947154209 is a prime.

It is a super-2 number, since 2×947285281² = 1794698807198497922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (947385281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473642640 + 473642641.

It is an arithmetic number, because the mean of its divisors is an integer number (473642641).

Almost surely, 2^947285281 is an apocalyptic number.

It is an amenable number.

947285281 is a deficient number, since it is larger than the sum of its proper divisors (1).

947285281 is an equidigital number, since it uses as much as digits as its factorization.

947285281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 947285281 is about 30777.9999512639. Note that the first 4 decimals coincide. The cubic root of 947285281 is about 982.1102938989.

The spelling of 947285281 in words is "nine hundred forty-seven million, two hundred eighty-five thousand, two hundred eighty-one".