319997947 has 2 divisors, whose sum is σ = 319997948. Its totient is φ = 319997946.

The previous prime is 319997917. The next prime is 319997969. The reversal of 319997947 is 749799913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 319997947 - 2¹⁵ = 319965179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 319997891 and 319997900.

It is not a weakly prime, because it can be changed into another prime (319997917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159998973 + 159998974.

It is an arithmetic number, because the mean of its divisors is an integer number (159998974).

Almost surely, 2^319997947 is an apocalyptic number.

319997947 is a deficient number, since it is larger than the sum of its proper divisors (1).

319997947 is an equidigital number, since it uses as much as digits as its factorization.

319997947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3857868, while the sum is 58.

The square root of 319997947 is about 17888.4864368118. The cubic root of 319997947 is about 683.9889159256.

The spelling of 319997947 in words is "three hundred nineteen million, nine hundred ninety-seven thousand, nine hundred forty-seven".