681368473 has 2 divisors, whose sum is σ = 681368474. Its totient is φ = 681368472.

The previous prime is 681368419. The next prime is 681368563. The reversal of 681368473 is 374863186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595750464 + 85618009 = 24408^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 681368473 - 2⁹ = 681367961 is a prime.

It is not a weakly prime, because it can be changed into another prime (681368173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340684236 + 340684237.

It is an arithmetic number, because the mean of its divisors is an integer number (340684237).

Almost surely, 2^681368473 is an apocalyptic number.

It is an amenable number.

681368473 is a deficient number, since it is larger than the sum of its proper divisors (1).

681368473 is an equidigital number, since it uses as much as digits as its factorization.

681368473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 681368473 is about 26103.0357046839. The cubic root of 681368473 is about 879.9554355015.

The spelling of 681368473 in words is "six hundred eighty-one million, three hundred sixty-eight thousand, four hundred seventy-three".