947281691 has 2 divisors, whose sum is σ = 947281692. Its totient is φ = 947281690.

The previous prime is 947281681. The next prime is 947281693. The reversal of 947281691 is 196182749.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 947281691 - 2¹⁸ = 947019547 is a prime.

Together with 947281693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (947281693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473640845 + 473640846.

It is an arithmetic number, because the mean of its divisors is an integer number (473640846).

Almost surely, 2^947281691 is an apocalyptic number.

947281691 is a deficient number, since it is larger than the sum of its proper divisors (1).

947281691 is an equidigital number, since it uses as much as digits as its factorization.

947281691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 947281691 is about 30777.9416303300. The cubic root of 947281691 is about 982.1090532377.

The spelling of 947281691 in words is "nine hundred forty-seven million, two hundred eighty-one thousand, six hundred ninety-one".