320654861 has 2 divisors, whose sum is σ = 320654862. Its totient is φ = 320654860.

The previous prime is 320654837. The next prime is 320654881. The reversal of 320654861 is 168456023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304502500 + 16152361 = 17450^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 320654861 - 2¹⁸ = 320392717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320654881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160327430 + 160327431.

It is an arithmetic number, because the mean of its divisors is an integer number (160327431).

Almost surely, 2^320654861 is an apocalyptic number.

It is an amenable number.

320654861 is a deficient number, since it is larger than the sum of its proper divisors (1).

320654861 is an equidigital number, since it uses as much as digits as its factorization.

320654861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 320654861 is about 17906.8383864936. The cubic root of 320654861 is about 684.4566426540.

The spelling of 320654861 in words is "three hundred twenty million, six hundred fifty-four thousand, eight hundred sixty-one".