947281091 has 2 divisors, whose sum is σ = 947281092. Its totient is φ = 947281090.

The previous prime is 947281073. The next prime is 947281109. The reversal of 947281091 is 190182749.

Together with next prime (947281109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (947281073) and next prime (947281109).

It is an emirp because it is prime and its reverse (190182749) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947281091 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (947281691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473640545 + 473640546.

It is an arithmetic number, because the mean of its divisors is an integer number (473640546).

Almost surely, 2^947281091 is an apocalyptic number.

947281091 is a deficient number, since it is larger than the sum of its proper divisors (1).

947281091 is an equidigital number, since it uses as much as digits as its factorization.

947281091 is an evil number, because the sum of its binary digits is even.

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

The square root of 947281091 is about 30777.9318830879. The cubic root of 947281091 is about 982.1088458845.

The spelling of 947281091 in words is "nine hundred forty-seven million, two hundred eighty-one thousand, ninety-one".