320231748217 has 2 divisors, whose sum is σ = 320231748218. Its totient is φ = 320231748216.

The previous prime is 320231748173. The next prime is 320231748229. The reversal of 320231748217 is 712847132023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196409398761 + 123822349456 = 443181^2 + 351884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320231748217 is a prime.

It is a super-2 number, since 2×320231748217² (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 320231748217.

It is not a weakly prime, because it can be changed into another prime (320231748517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160115874108 + 160115874109.

It is an arithmetic number, because the mean of its divisors is an integer number (160115874109).

Almost surely, 2^320231748217 is an apocalyptic number.

It is an amenable number.

320231748217 is a deficient number, since it is larger than the sum of its proper divisors (1).

320231748217 is an equidigital number, since it uses as much as digits as its factorization.

320231748217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 320231748217 in words is "three hundred twenty billion, two hundred thirty-one million, seven hundred forty-eight thousand, two hundred seventeen".