947821307 has 2 divisors, whose sum is σ = 947821308. Its totient is φ = 947821306.

The previous prime is 947821243. The next prime is 947821321. The reversal of 947821307 is 703128749.

It is a strong prime.

It is an emirp because it is prime and its reverse (703128749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 947821307 - 2⁶ = 947821243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (947821507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473910653 + 473910654.

It is an arithmetic number, because the mean of its divisors is an integer number (473910654).

Almost surely, 2^947821307 is an apocalyptic number.

947821307 is a deficient number, since it is larger than the sum of its proper divisors (1).

947821307 is an equidigital number, since it uses as much as digits as its factorization.

947821307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 947821307 is about 30786.7066605053. The cubic root of 947821307 is about 982.2955029373.

The spelling of 947821307 in words is "nine hundred forty-seven million, eight hundred twenty-one thousand, three hundred seven".