320654989 has 2 divisors, whose sum is σ = 320654990. Its totient is φ = 320654988.

The previous prime is 320654959. The next prime is 320655007. The reversal of 320654989 is 989456023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222308100 + 98346889 = 14910^2 + 9917^2 .

It is an emirp because it is prime and its reverse (989456023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320654989 - 2⁷ = 320654861 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 (320654959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160327494 + 160327495.

It is an arithmetic number, because the mean of its divisors is an integer number (160327495).

Almost surely, 2^320654989 is an apocalyptic number.

It is an amenable number.

320654989 is a deficient number, since it is larger than the sum of its proper divisors (1).

320654989 is an equidigital number, since it uses as much as digits as its factorization.

320654989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 320654989 is about 17906.8419605468. The cubic root of 320654989 is about 684.4567337285.

The spelling of 320654989 in words is "three hundred twenty million, six hundred fifty-four thousand, nine hundred eighty-nine".