320099789 has 2 divisors, whose sum is σ = 320099790. Its totient is φ = 320099788.

The previous prime is 320099761. The next prime is 320099849. The reversal of 320099789 is 987990023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253350889 + 66748900 = 15917^2 + 8170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320099789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320099719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160049894 + 160049895.

It is an arithmetic number, because the mean of its divisors is an integer number (160049895).

Almost surely, 2^320099789 is an apocalyptic number.

It is an amenable number.

320099789 is a deficient number, since it is larger than the sum of its proper divisors (1).

320099789 is an equidigital number, since it uses as much as digits as its factorization.

320099789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 320099789 is about 17891.3327899293. The cubic root of 320099789 is about 684.0614699439.

The spelling of 320099789 in words is "three hundred twenty million, ninety-nine thousand, seven hundred eighty-nine".