320949997 has 2 divisors, whose sum is σ = 320949998. Its totient is φ = 320949996.

The previous prime is 320949971. The next prime is 320950057. The reversal of 320949997 is 799949023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247779081 + 73170916 = 15741^2 + 8554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320949997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320949697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160474998 + 160474999.

It is an arithmetic number, because the mean of its divisors is an integer number (160474999).

Almost surely, 2^320949997 is an apocalyptic number.

It is an amenable number.

320949997 is a deficient number, since it is larger than the sum of its proper divisors (1).

320949997 is an equidigital number, since it uses as much as digits as its factorization.

320949997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 320949997 is about 17915.0773651693. The cubic root of 320949997 is about 684.6665733041. Note that the first 3 decimals are identical.

The spelling of 320949997 in words is "three hundred twenty million, nine hundred forty-nine thousand, nine hundred ninety-seven".