681327313 has 2 divisors, whose sum is σ = 681327314. Its totient is φ = 681327312.

The previous prime is 681327271. The next prime is 681327319. The reversal of 681327313 is 313723186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559180609 + 122146704 = 23647^2 + 11052^2 .

It is a cyclic number.

It is not a de Polignac number, because 681327313 - 2²¹ = 679230161 is a prime.

It is not a weakly prime, because it can be changed into another prime (681327319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340663656 + 340663657.

It is an arithmetic number, because the mean of its divisors is an integer number (340663657).

Almost surely, 2^681327313 is an apocalyptic number.

It is an amenable number.

681327313 is a deficient number, since it is larger than the sum of its proper divisors (1).

681327313 is an equidigital number, since it uses as much as digits as its factorization.

681327313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 681327313 is about 26102.2472787306. The cubic root of 681327313 is about 879.9377164080.

The spelling of 681327313 in words is "six hundred eighty-one million, three hundred twenty-seven thousand, three hundred thirteen".