681846379 has 2 divisors, whose sum is σ = 681846380. Its totient is φ = 681846378.

The previous prime is 681846377. The next prime is 681846433. The reversal of 681846379 is 973648186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681846379 - 2¹ = 681846377 is a prime.

Together with 681846377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (681846377) 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, 340923189 + 340923190.

It is an arithmetic number, because the mean of its divisors is an integer number (340923190).

Almost surely, 2^681846379 is an apocalyptic number.

681846379 is a deficient number, since it is larger than the sum of its proper divisors (1).

681846379 is an equidigital number, since it uses as much as digits as its factorization.

681846379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 681846379 is about 26112.1883226971. The cubic root of 681846379 is about 880.1611184847.

The spelling of 681846379 in words is "six hundred eighty-one million, eight hundred forty-six thousand, three hundred seventy-nine".