947381647 has 2 divisors, whose sum is σ = 947381648. Its totient is φ = 947381646.

The previous prime is 947381621. The next prime is 947381653. The reversal of 947381647 is 746183749.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 947381647 - 2¹¹ = 947379599 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 947381647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947381447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473690823 + 473690824.

It is an arithmetic number, because the mean of its divisors is an integer number (473690824).

Almost surely, 2^947381647 is an apocalyptic number.

947381647 is a deficient number, since it is larger than the sum of its proper divisors (1).

947381647 is an equidigital number, since it uses as much as digits as its factorization.

947381647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 947381647 is about 30779.5654127865. The cubic root of 947381647 is about 982.1435956696.

The spelling of 947381647 in words is "nine hundred forty-seven million, three hundred eighty-one thousand, six hundred forty-seven".