320817919 has 2 divisors, whose sum is σ = 320817920. Its totient is φ = 320817918.

The previous prime is 320817899. The next prime is 320817929. The reversal of 320817919 is 919718023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320817919 is a prime.

It is a super-2 number, since 2×320817919² = 205848274302981122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320817929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160408959 + 160408960.

It is an arithmetic number, because the mean of its divisors is an integer number (160408960).

Almost surely, 2^320817919 is an apocalyptic number.

320817919 is a deficient number, since it is larger than the sum of its proper divisors (1).

320817919 is an equidigital number, since it uses as much as digits as its factorization.

320817919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 320817919 is about 17911.3907611888. The cubic root of 320817919 is about 684.5726419545.

It can be divided in two parts, 32081 and 7919, that added together give a square (40000 = 200²).

The spelling of 320817919 in words is "three hundred twenty million, eight hundred seventeen thousand, nine hundred nineteen".