681907847 has 2 divisors, whose sum is σ = 681907848. Its totient is φ = 681907846.

The previous prime is 681907829. The next prime is 681907861. The reversal of 681907847 is 748709186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681907847 - 2¹² = 681903751 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 681907795 and 681907804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681907867) 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, 340953923 + 340953924.

It is an arithmetic number, because the mean of its divisors is an integer number (340953924).

Almost surely, 2^681907847 is an apocalyptic number.

681907847 is a deficient number, since it is larger than the sum of its proper divisors (1).

681907847 is an equidigital number, since it uses as much as digits as its factorization.

681907847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 681907847 is about 26113.3652944235. The cubic root of 681907847 is about 880.1875663375.

The spelling of 681907847 in words is "six hundred eighty-one million, nine hundred seven thousand, eight hundred forty-seven".