681487297 has 2 divisors, whose sum is σ = 681487298. Its totient is φ = 681487296.

The previous prime is 681487273. The next prime is 681487319. The reversal of 681487297 is 792784186.

681487297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649179441 + 32307856 = 25479^2 + 5684^2 .

It is a cyclic number.

It is not a de Polignac number, because 681487297 - 2¹¹ = 681485249 is a prime.

It is not a weakly prime, because it can be changed into another prime (681487237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340743648 + 340743649.

It is an arithmetic number, because the mean of its divisors is an integer number (340743649).

Almost surely, 2^681487297 is an apocalyptic number.

It is an amenable number.

681487297 is a deficient number, since it is larger than the sum of its proper divisors (1).

681487297 is an equidigital number, since it uses as much as digits as its factorization.

681487297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 52.

The square root of 681487297 is about 26105.3116625717. The cubic root of 681487297 is about 880.0065844032.

The spelling of 681487297 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, two hundred ninety-seven".