681487337 has 2 divisors, whose sum is σ = 681487338. Its totient is φ = 681487336.

The previous prime is 681487333. The next prime is 681487361. The reversal of 681487337 is 733784186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493550656 + 187936681 = 22216^2 + 13709^2 .

It is a cyclic number.

It is not a de Polignac number, because 681487337 - 2² = 681487333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681487291 and 681487300.

It is not a weakly prime, because it can be changed into another prime (681487333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340743668 + 340743669.

It is an arithmetic number, because the mean of its divisors is an integer number (340743669).

Almost surely, 2^681487337 is an apocalyptic number.

It is an amenable number.

681487337 is a deficient number, since it is larger than the sum of its proper divisors (1).

681487337 is an equidigital number, since it uses as much as digits as its factorization.

681487337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 681487337 is about 26105.3124286993. The cubic root of 681487337 is about 880.0066016206.

The spelling of 681487337 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, three hundred thirty-seven".