947281109 has 2 divisors, whose sum is σ = 947281110. Its totient is φ = 947281108.

The previous prime is 947281091. The next prime is 947281187. The reversal of 947281109 is 901182749.

Together with previous prime (947281091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 789778609 + 157502500 = 28103^2 + 12550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947281109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947281409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473640554 + 473640555.

It is an arithmetic number, because the mean of its divisors is an integer number (473640555).

Almost surely, 2^947281109 is an apocalyptic number.

It is an amenable number.

947281109 is a deficient number, since it is larger than the sum of its proper divisors (1).

947281109 is an equidigital number, since it uses as much as digits as its factorization.

947281109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 947281109 is about 30777.9321755052. The cubic root of 947281109 is about 982.1088521051.

The spelling of 947281109 in words is "nine hundred forty-seven million, two hundred eighty-one thousand, one hundred nine".