320649599 has 2 divisors, whose sum is σ = 320649600. Its totient is φ = 320649598.

The previous prime is 320649587. The next prime is 320649661. The reversal of 320649599 is 995946023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320649599 - 2¹² = 320645503 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320649499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160324799 + 160324800.

It is an arithmetic number, because the mean of its divisors is an integer number (160324800).

Almost surely, 2^320649599 is an apocalyptic number.

320649599 is a deficient number, since it is larger than the sum of its proper divisors (1).

320649599 is an equidigital number, since it uses as much as digits as its factorization.

320649599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 320649599 is about 17906.6914587815. The cubic root of 320649599 is about 684.4528986174.

The spelling of 320649599 in words is "three hundred twenty million, six hundred forty-nine thousand, five hundred ninety-nine".