320131311281 has 2 divisors, whose sum is σ = 320131311282. Its totient is φ = 320131311280.

The previous prime is 320131311229. The next prime is 320131311299. The reversal of 320131311281 is 182113131023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316276888225 + 3854423056 = 562385^2 + 62084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320131311281 is a prime.

It is a super-2 number, since 2×320131311281² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320131311281.

It is not a weakly prime, because it can be changed into another prime (320131311781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160065655640 + 160065655641.

It is an arithmetic number, because the mean of its divisors is an integer number (160065655641).

Almost surely, 2^320131311281 is an apocalyptic number.

It is an amenable number.

320131311281 is a deficient number, since it is larger than the sum of its proper divisors (1).

320131311281 is an equidigital number, since it uses as much as digits as its factorization.

320131311281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 320131311281 in words is "three hundred twenty billion, one hundred thirty-one million, three hundred eleven thousand, two hundred eighty-one".