320935981589 has 2 divisors, whose sum is σ = 320935981590. Its totient is φ = 320935981588.

The previous prime is 320935981577. The next prime is 320935981591. The reversal of 320935981589 is 985189539023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247763026564 + 73172955025 = 497758^2 + 270505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320935981589 is a prime.

It is a Sophie Germain prime.

Together with 320935981591, it forms a pair of twin primes.

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 (320935981529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160467990794 + 160467990795.

It is an arithmetic number, because the mean of its divisors is an integer number (160467990795).

Almost surely, 2^320935981589 is an apocalyptic number.

It is an amenable number.

320935981589 is a deficient number, since it is larger than the sum of its proper divisors (1).

320935981589 is an equidigital number, since it uses as much as digits as its factorization.

320935981589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20995200, while the sum is 62.

The spelling of 320935981589 in words is "three hundred twenty billion, nine hundred thirty-five million, nine hundred eighty-one thousand, five hundred eighty-nine".