947895661 has 2 divisors, whose sum is σ = 947895662. Its totient is φ = 947895660.

The previous prime is 947895659. The next prime is 947895703. The reversal of 947895661 is 166598749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717918436 + 229977225 = 26794^2 + 15165^2 .

It is a cyclic number.

It is not a de Polignac number, because 947895661 - 2¹ = 947895659 is a prime.

Together with 947895659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947895601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473947830 + 473947831.

It is an arithmetic number, because the mean of its divisors is an integer number (473947831).

Almost surely, 2^947895661 is an apocalyptic number.

It is an amenable number.

947895661 is a deficient number, since it is larger than the sum of its proper divisors (1).

947895661 is an equidigital number, since it uses as much as digits as its factorization.

947895661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The square root of 947895661 is about 30787.9142034663. The cubic root of 947895661 is about 982.3211884013.

The spelling of 947895661 in words is "nine hundred forty-seven million, eight hundred ninety-five thousand, six hundred sixty-one".