681317323 has 2 divisors, whose sum is σ = 681317324. Its totient is φ = 681317322.

The previous prime is 681317317. The next prime is 681317353. The reversal of 681317323 is 323713186.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681317323 is a prime.

It is not a weakly prime, because it can be changed into another prime (681317353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340658661 + 340658662.

It is an arithmetic number, because the mean of its divisors is an integer number (340658662).

Almost surely, 2^681317323 is an apocalyptic number.

681317323 is a deficient number, since it is larger than the sum of its proper divisors (1).

681317323 is an equidigital number, since it uses as much as digits as its factorization.

681317323 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 681317323 is about 26102.0559151956. The cubic root of 681317323 is about 879.9334156749.

The spelling of 681317323 in words is "six hundred eighty-one million, three hundred seventeen thousand, three hundred twenty-three".