947975321 has 2 divisors, whose sum is σ = 947975322. Its totient is φ = 947975320.

The previous prime is 947975317. The next prime is 947975323. The reversal of 947975321 is 123579749.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525097225 + 422878096 = 22915^2 + 20564^2 .

It is a cyclic number.

It is not a de Polignac number, because 947975321 - 2² = 947975317 is a prime.

It is a Sophie Germain prime.

Together with 947975323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (947975323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473987660 + 473987661.

It is an arithmetic number, because the mean of its divisors is an integer number (473987661).

Almost surely, 2^947975321 is an apocalyptic number.

It is an amenable number.

947975321 is a deficient number, since it is larger than the sum of its proper divisors (1).

947975321 is an equidigital number, since it uses as much as digits as its factorization.

947975321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 47.

The square root of 947975321 is about 30789.2078657441. The cubic root of 947975321 is about 982.3487053236.

The spelling of 947975321 in words is "nine hundred forty-seven million, nine hundred seventy-five thousand, three hundred twenty-one".