947257807 has 2 divisors, whose sum is σ = 947257808. Its totient is φ = 947257806.

The previous prime is 947257777. The next prime is 947257823. The reversal of 947257807 is 708752749.

947257807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (708752749) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947257807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947257307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473628903 + 473628904.

It is an arithmetic number, because the mean of its divisors is an integer number (473628904).

Almost surely, 2^947257807 is an apocalyptic number.

947257807 is a deficient number, since it is larger than the sum of its proper divisors (1).

947257807 is an equidigital number, since it uses as much as digits as its factorization.

947257807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 947257807 is about 30777.5536227297. The cubic root of 947257807 is about 982.1007991319.

The spelling of 947257807 in words is "nine hundred forty-seven million, two hundred fifty-seven thousand, eight hundred seven".