681828487 has 2 divisors, whose sum is σ = 681828488. Its totient is φ = 681828486.

The previous prime is 681828457. The next prime is 681828527. The reversal of 681828487 is 784828186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681828487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681828457) 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, 340914243 + 340914244.

It is an arithmetic number, because the mean of its divisors is an integer number (340914244).

Almost surely, 2^681828487 is an apocalyptic number.

681828487 is a deficient number, since it is larger than the sum of its proper divisors (1).

681828487 is an equidigital number, since it uses as much as digits as its factorization.

681828487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1376256, while the sum is 52.

The square root of 681828487 is about 26111.8457218175. The cubic root of 681828487 is about 880.1534197904.

The spelling of 681828487 in words is "six hundred eighty-one million, eight hundred twenty-eight thousand, four hundred eighty-seven".