681828457 has 2 divisors, whose sum is σ = 681828458. Its totient is φ = 681828456.

The previous prime is 681828443. The next prime is 681828487. The reversal of 681828457 is 754828186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617572201 + 64256256 = 24851^2 + 8016^2 .

It is a cyclic number.

It is not a de Polignac number, because 681828457 - 2¹⁵ = 681795689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681828457.

It is not a weakly prime, because it can be changed into another prime (681828487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340914228 + 340914229.

It is an arithmetic number, because the mean of its divisors is an integer number (340914229).

Almost surely, 2^681828457 is an apocalyptic number.

It is an amenable number.

681828457 is a deficient number, since it is larger than the sum of its proper divisors (1).

681828457 is an equidigital number, since it uses as much as digits as its factorization.

681828457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860160, while the sum is 49.

The square root of 681828457 is about 26111.8451473656. The cubic root of 681828457 is about 880.1534068817.

The spelling of 681828457 in words is "six hundred eighty-one million, eight hundred twenty-eight thousand, four hundred fifty-seven".